Good (adjective): having positive qualities; of a high standard; morally right or virtuous. "She is very good at explaining grammar clearly."
Good (noun): benefit, advantage, or moral virtue. "They worked together for the good of the school."
What Does Good Mean?
Good comes from Old English gōd, meaning "virtuous, fitting, or desirable", and is related to Old Norse góðr and Old High German guot. All trace back to Proto-Germanic *gōdaz, possibly from a root meaning "to fit together" or "to unite". The word has been at the core of English since its earliest written records — making it one of the oldest continuously used adjectives in the language.
As an adjective, good covers a wide range of positive meanings: high quality (a good meal), moral virtue (a good person), suitability (a good time to call), skill (good at maths), and benefit (exercise is good for you). As a noun, it appears in fixed phrases: for the common good, do good, for good (meaning permanently).
Because good is one of the most frequent words in English, understanding its many uses — and its irregular comparative forms (better, best) — is essential for learners at every level. Its adverb equivalent is well, not goodly: say "she sings well", not "she sings good".
Example Sentences (A2–C1)
| Sentence | Level | Usage note |
|---|---|---|
| She is very good at explaining grammar clearly. | A2 | good at + gerund — describing a skill |
| That was a really good idea — let's try it tomorrow. | A2 | good + noun — describing quality |
| Regular exercise is good for your physical and mental health. | B1 | good for + noun — expressing benefit |
| The charity does a great deal of good in the local community. | B2 | good as noun — moral benefit or positive action |
| Acting in good faith, she disclosed all the relevant information to the board. | C1 | in good faith — formal fixed phrase meaning honestly |
Collocations
These are the most natural word combinations with good in everyday and professional English:
Usage Notes
Good vs Well
Good is an adjective and describes nouns or follows linking verbs: "The food tastes good.", "She is a good teacher."
Well is the adverb and describes how an action is performed: "She teaches well.", "He did well in the exam."
Exception: well also functions as an adjective meaning healthy: "I don't feel well today." In this case both "I feel good" and "I feel well" are grammatically correct, but with slightly different nuances — good suggests a general positive state, while well specifically refers to physical health.
Good as a Noun
As a noun, good is nearly always uncountable and appears in fixed expressions: for the good of (benefiting), do good (act virtuously or helpfully), for good (permanently or forever), no good (useless or harmful).
Do not confuse the noun good with the plural noun goods, which is a completely separate word meaning products, merchandise, or possessions: "The ship was carrying imported goods."
Synonyms
Antonyms
Common Mistakes
Watch Out For
She did good in the test.
She did well in the test. (use the adverb well to modify a verb)
He is a very goodly player.
He is a very good player. (goodly is an archaic or literary word meaning large in size, not a modern adverb)
It was a gooder result than last time.
It was a better result than last time. (good has an irregular comparative: good → better → best)
The goods news is that we passed.
The good news is that we passed. (good is an adjective here; goods is a separate noun meaning products)