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Good vs Well — What’s the Difference?

Good is an adjective that describes nouns — it tells you about the quality of a person, place, or thing. Well is primarily an adverb that describes verbs — it tells you how an action is performed. The key difference: use “good” before or after a noun (with a linking verb), and use “well” to describe how someone does something. This is one of the most common grammar mistakes in English, partly because “I’m good” and “I’m well” are both correct in different contexts.

Why Getting This Right Matters

The good/well distinction is one of the first grammar rules hiring managers, professors, and editors notice when it is broken. Writing “I communicate good with clients” in a cover letter immediately undermines your claim of communication skills. In academic papers, using “good” as an adverb marks your writing as informal and can cost you credibility points. In business presentations, saying “the project went good” in front of stakeholders signals a lack of polish that contrasts with the professionalism you are trying to convey. Mastering this pair is a high-leverage grammar fix — it is easy to learn and immediately elevates how others perceive your language ability.

What Does “Good” Mean?

“Good” is one of the most versatile adjectives in the English language. At its core, it means “of a high standard,” “satisfactory,” or “morally right.” As an adjective, its grammatical role is to modify nouns: a good book, a good idea, a good person. It can also follow linking verbs such as “be,” “seem,” “feel,” “look,” “taste,” and “smell,” where it describes the subject rather than the action.

This linking-verb usage is where much of the confusion arises. When you say “The soup tastes good,” you are describing the soup (a noun), not the act of tasting. Similarly, “I feel good” describes your emotional or general state — you are in a positive condition. This is grammatically correct because “feel” here acts as a linking verb connecting “I” to the adjective “good.”

In terms of register, using “good” correctly after linking verbs is accepted at every level of formality. However, using “good” where “well” belongs — such as “she did good” to mean she performed capably — is characteristic of informal, colloquial English. In a job interview, a cover letter, or an academic paper, this substitution would be considered a grammatical error.

“Good” can also function as a noun in certain expressions: “the common good,” “for good” (meaning permanently), or “goods” (meaning products). These uses are distinct from the adjective and rarely cause confusion with “well.” The trouble almost always centers on whether to use “good” or “well” after a verb, which depends on whether that verb is a linking verb or an action verb.

What Does “Well” Mean?

“Well” is primarily an adverb, meaning it modifies verbs, adjectives, or other adverbs. When someone says “She writes well,” the word “well” describes how she writes — the manner of the action. This is the fundamental grammatical role of adverbs, and “well” is the adverb form that corresponds to the adjective “good.”

However, “well” also functions as an adjective in one specific context: health. When you say “I am well,” you mean “I am in good health.” This usage dates back centuries and is firmly established in standard English. It explains why both “I’m good” and “I’m well” are correct responses to “How are you?” — they simply emphasize different things. “I’m good” speaks to your general state or mood, while “I’m well” speaks specifically to your physical health.

“Well” appears in numerous compound words and fixed expressions: well-known, well-read, well-being, as well as, well done. In each case, it carries its adverbial sense of “in a good or satisfactory manner.” Understanding that “well” is the adverb counterpart to “good” solves most of the confusion between these two words. For other adjective-adverb distinctions, explore our guide on fewer vs less.

Key Differences Between Good and Well

The grammatical rule is straightforward: good modifies nouns; well modifies verbs. If you are describing a thing, use “good.” If you are describing how something is done, use “well.”

Consider these pairs: “She is a good dancer” (good modifies “dancer,” a noun) versus “She dances well” (well modifies “dances,” a verb). “He gave a good speech” (good modifies “speech”) versus “He spoke well” (well modifies “spoke”). The pattern is consistent: adjective for the noun, adverb for the verb.

The complexity enters with linking verbs. Linking verbs (be, seem, appear, feel, look, taste, smell, sound, become) connect the subject to a description of that subject. After a linking verb, you use an adjective, not an adverb. That is why “The food smells good” is correct (you are describing the food), but “She performed good” is incorrect (you are describing how she performed, which requires the adverb “well”).

The health exception is the one case where “well” acts as an adjective after a linking verb. “He looks well” means he looks healthy. “He looks good” could mean he looks attractive or generally fine. Both are correct, but they convey slightly different meanings. This subtlety is worth noting, especially in formal writing where precision matters. For more on tricky distinctions in English, see weather vs whether.

Grammatical category: This is an adjective-adverb confusion pair — a category of error where speakers use an adjective where standard grammar requires an adverb, or vice versa. Unlike homophone pairs (which sound alike but are spelled differently), “good” and “well” are spelled and pronounced differently; the confusion arises entirely from overlapping grammatical territory, particularly around linking verbs.

The linguistic WHY: In Old English, adjectives and adverbs were more clearly distinguished by inflectional endings. As English lost most of its inflections during the Middle English period, the boundary between adjectives and adverbs blurred. “Good” (from Old English god) has always been an adjective, while “well” (from Old English wel) has always been an adverb — but the erosion of formal case markers made it easier for speakers to use adjectives in adverbial positions. This drift has been documented since at least the 18th century, when grammarians like Robert Lowth began codifying the distinction. The AP Stylebook and the Chicago Manual of Style both maintain that “good” should not be used as an adverb in edited prose, while acknowledging that “well” functions as an adjective only in health-related contexts.

Good vs Well — Examples in Context

Correct: She speaks French well.
Incorrect: She speaks French good.

Correct: That was a good presentation.
Incorrect: That was a well presentation.

Correct: The team played well in the second half.
Incorrect: The team played good in the second half.

Correct: This coffee tastes good.
(“Tastes” is a linking verb here, so the adjective “good” is correct.)

Correct: I don’t feel well today. I think I’m coming down with something.
(“Well” as an adjective meaning “in good health.”)

Correct: I feel good about the decision we made.
(“Good” is an adjective describing the speaker’s emotional state.)

Correct: He did well on the exam.
Incorrect: He did good on the exam.

Correct: The car runs well after the tune-up.
Incorrect: The car runs good after the tune-up.

Correct: She is a good listener and communicates well.
(Both “good” and “well” used correctly in one sentence.)

Professional email: “The new onboarding process is working well — retention has improved by 15%.” ✓

Common mistake: “The new onboarding process is working good.” ✗ (“Working” is an action verb here, so it requires the adverb “well,” not the adjective “good.”)

Academic writing: “The regression model performed well across all three validation sets.” ✓

Common mistake: “The regression model performed good across all three validation sets.” ✗ (Academic writing demands standard adverb usage — “performed” is an action verb.)

Casual / social media: “Feeling good about this weekend’s race” ✓

Also correct: “Feeling well after recovering from the flu.” (When describing health specifically, “well” is correct after “feeling.”)

Job application: “I collaborate well with cross-functional teams and adapt quickly to new workflows.” ✓

Common mistake: “I collaborate good with cross-functional teams.” ✗ (In a resume or cover letter, this error is particularly damaging — it contradicts the very communication skills you are claiming.)

Common Mistakes and How to Avoid Them

The biggest mistake is using “good” as an adverb. Phrases like “She sings good” or “He plays basketball good” are grammatically incorrect in standard English, though they are common in casual speech. The fix is always the same: if you are describing how an action is performed, switch to “well.”

Another frequent error is overcorrecting. Some speakers, having been told to use “well” more often, say things like “I feel well about the project” when they mean they are optimistic or satisfied. In this context, “I feel good about the project” is correct because you are describing your emotional state, not your health. “Well” after “feel” should generally be reserved for health-related statements.

A third pitfall is the phrase “I’m doing good” versus “I’m doing well.” Strictly speaking, “I’m doing well” is grammatically correct because “doing” is an action verb that requires an adverb. “I’m doing good” implies you are performing acts of charity. In practice, most people use them interchangeably, but formal writing and careful speech call for “I’m doing well.”

One tricky edge case involves the verb “do” paired with “well” versus “good” in comparative and superlative forms. The comparative of “well” is “better,” and the superlative is “best” — the same forms used for “good.” This overlap means sentences like “She performed better than expected” work regardless of whether you think of “better” as modifying the noun or the verb. The problem disappears in the comparative, but returns in the base form: “She performs well” (not “good”).

The #1 mistake pattern: The most common error structure is “[subject] + [action verb] + good” — as in “She sings good,” “He drives good,” or “They handled it good.” In every one of these cases, the action verb needs the adverb “well.” Train yourself to ask: “Is the verb describing an action someone performs?” If yes, use “well.”

The exception that proves the rule: After linking verbs like “be,” “seem,” “look,” “taste,” “smell,” and “sound,” both “good” and “well” can be grammatically correct — but with different meanings. “She looks good” means she is attractive or put-together. “She looks well” means she appears healthy. Neither sentence is wrong; they simply say different things. This is the one area where the good/well choice is about meaning, not grammar.

The non-native speaker angle: Speakers of languages that do not morphologically distinguish adjectives from adverbs — including Mandarin, Japanese, and Korean — find this pair especially challenging because the concept of a separate adverb form for “good” simply does not exist in their grammar systems. The habit of saying “good” in adverb positions transfers directly from their native-language pattern.

Quick Memory Trick

Picture Superman: He is a good hero (describing the hero — a noun). He flies well (describing how he flies — an action). Good answers “what kind?” and well answers “how?” If your sentence answers “what kind of [noun]?” use good. If it answers “how does [someone] do [something]?” use well. The one exception: “I am well” = “I am healthy” — the only time well acts as an adjective. Test it: “She played ___.” How did she play? Well. For help with more grammar puzzles, visit our grammar check for Google Docs guide.

Related Confused Word Pairs

Master more commonly confused words with these guides:

• Fewer vs Less
• Migration vs Immigration
• Weather vs Whether

And for real-time grammar checking in Google Docs, see our grammar check for Google Docs tutorial.

FAQ

Is “I’m good” grammatically correct?
Yes. “I’m good” is grammatically correct. “Am” is a linking verb, so it takes the adjective “good” to describe your state. It means you are in a satisfactory or positive condition. It is perfectly appropriate as a response to “How are you?”

When should I say “I’m well” instead of “I’m good”?
Say “I’m well” when you specifically mean you are in good physical health, especially if someone has asked about your health or you have recently been ill. “I’m good” covers a broader range of positive states including mood and general satisfaction.

Is “I did good” ever correct?
In standard grammar, “I did well” is correct when describing performance, because “did” is an action verb that requires the adverb “well.” However, “I did good” can be correct if you mean you performed charitable acts — “did good” as in “did good deeds.” Context determines the meaning.

Can “well” be an adjective?
Yes, but only when referring to health. “She is well” means “She is healthy.” In all other cases, “well” functions as an adverb. This health-related adjective use of “well” is the main exception to the “good = adjective, well = adverb” rule.

Why is “good” so often misused as an adverb?
Casual English frequently drops the adjective-adverb distinction. Phrases like “She did good” and “It works good” are extremely common in everyday speech. Over time, informal usage has normalized “good” as an adverb in spoken language, even though it remains nonstandard in edited writing.