Good vs Well

The Short Answer

Good is an adjective, so it describes a noun: a good book, good coffee, good news. Well is an adverb, so it describes a verb — how something is done: she sings well, the car runs well, you did well. The rule of thumb: you do a good job, but you do the job well. There are two twists to remember — after linking verbs like taste, look, and seem you use good ("it tastes good"), and well can also be an adjective when it means "in good health" ("I feel well").

Good Is an Adjective

An adjective modifies a noun or pronoun. Good tells you something about a person, place, or thing:

• a good teacher
• good weather
• The idea is good.
• These are good shoes.

If you can point to the noun the word is describing, "good" is almost always what you want. It does not describe a verb — that is the adverb's job.

Well Is an Adverb

An adverb modifies a verb, an adjective, or another adverb. Well usually tells you how an action is performed:

• She writes well.
• He plays the guitar well.
• The team worked well together.
• The medicine works well.

It can also modify an adjective or participle — which is why we talk about a well-written report, a well-known author, or a well-behaved dog. Whenever the word is pinned to an action or describes how something was done, well is the safe choice.

The Linking-Verb Trap

This is where most mistakes happen. Linking verbs — be, seem, look, feel, taste, smell, sound, appear, become — do not describe an action. They connect the subject to a word that describes the subject. Because that word describes a noun, it must be an adjective, so you use good, not "well":

• ✓ The soup tastes good. (not "tastes well" — unless the soup has a working tongue!)
• ✓ You look good today.
• ✓ That plan sounds good.
• ✓ The roses smell good.

This is exactly why "I feel good" is correct English, no matter what a strict-sounding friend tells you. "Feel" is a linking verb, and "good" describes you, the subject. James Brown had it right in "I Got You (I Feel Good)."

Correct vs Incorrect

Action verbs need "well":

• ✓ She speaks French well. — ✗ She speaks French good.
• ✓ The printer works well. — ✗ The printer works good.
• ✓ Did you sleep well? — ✗ Did you sleep good?
• ✓ He handled the pressure well. — ✗ He handled the pressure good.

Nouns and linking verbs need "good":

• ✓ That was a good game. — ✗ That was a well game.
• ✓ This coffee tastes good. — ✗ This coffee tastes well.
• ✓ It's a good question. — ✗ It's a well question.

Well Can Also Mean "Healthy"

Here is the exception to the "well = adverb" rule: well is also an adjective when it refers to health. This is the one time "well" describes a noun rather than a verb:

• ✓ I don't feel well — I think I'm coming down with something.
• ✓ I hope you get well soon.
• ✓ She looks well after her holiday.

So "I feel well" is about your health, while "I feel good" is about your mood or general state. Both are correct; they just answer slightly different questions.

"I'm Good," "I'm Well," and "I'm Doing Well"

All three are correct, but they are not identical:

• "I'm good." Casual and grammatically fine. After the linking verb "am," "good" describes you and means I'm fine / content / all set. ("More coffee?" "No thanks, I'm good.")
• "I'm well." Here "well" is the health adjective — it means I'm in good health. It sounds a little more formal.
• "I'm doing well." "Doing" is an action verb, so it needs the adverb well. Note that "I'm doing good" literally means you are performing good deeds — which is what people mean when a charity "does a lot of good."

Did Well vs Did Good

Watch this pair closely:

• ✓ You did well on the exam. ("well" = adverb describing how you performed)
• ✗ You did good on the exam. (nonstandard for performance)
• ✓ Volunteers do good in their community. (here "good" is a noun — good works)

Tricky Cases and Exceptions

• "Look good" vs "look well." "You look good" praises your appearance; "you look well" says you look healthy. Both are correct — they simply mean different things.
• "Smell good" vs "smell well." "You smell good" is a compliment. "You smell well" technically means your nose works properly — the sort of thing you'd say about a bloodhound.
• "I feel badly" is usually wrong. People say it to sound correct, but "feel" is a linking verb, so the adjective "bad" is right: I feel bad (sorry or unwell). "I feel badly" would mean your sense of touch is faulty.
• "Good-looking," not "well-looking." English is idiomatic: we say a good-looking jacket even though the grammar might predict "well." Some compounds simply lock in.
• "Good" as an adverb is nonstandard. "He played good" or "it runs good" is common in casual and regional speech, but formal writing always uses "well."

A Memory Trick That Actually Works

Swap in bad or badly. They mirror good and well perfectly: "bad" is the adjective, "badly" is the adverb. Say the sentence with the "b" word, use whichever sounds right, then match it:

• "He plays badly" sounds right → adverb → "He plays well."
• "The soup tastes badly" sounds wrong; "tastes bad" is right → adjective → "tastes good."

If badly fits, use well. If bad fits, use good.

US vs UK Usage

The core grammar is identical on both sides of the Atlantic: British and American English follow the same adjective/adverb rule, and both use "well" for health. The only real difference is social, not grammatical. The reply "I'm good" (meaning "I'm fine, thanks") spread from American English and is now common everywhere, but some British speakers — and prescriptivists in both countries — still prefer "I'm well" or "I'm very well, thank you" in polite or formal settings. It's a matter of register, not right versus wrong.