So, what is an antonym? It is a word whose meaning is the opposite of another word: hot and cold, open and closed, buy and sell, early and late. The term joins Greek parts meaning "against" and "name", the same root that gives us synonym.
That sounds simple, yet opposites come in several kinds, and some words have more than one opposite depending on the sense. Below you will find a plain antonym definition, the main types with examples, the prefixes that build opposites, and tips for using antonyms to make contrasts sharper in your writing.
Swatch at a glance
Short definition
A word with the opposite meaning of another wordPart of speech
Noun (plural: antonyms)Adjective
antonymousPronunciation
AN tuh nimOpposite term
Common prefixes
un, in, im, dis, non, misWatch out
One word can have different opposites in different senses
What is an antonym? Definition and meaning
To define antonym in one sentence: an antonym is a word that means the reverse of another word in a given sense. The antonym meaning depends on that sense. Light has the opposite dark when you mean brightness and heavy when you mean weight. A good antonyms definition always carries that condition, because so many words carry several senses.
What does antonym mean in practice? When someone asks for the opposite of a word, they want the antonym. Antonyms always share a topic, and their meaning differs only in direction: hot and cold both describe temperature. The adjective antonymous exists but is rare outside language study.
The four main kinds of opposites
| Kind | How it works | Examples |
|---|---|---|
| Graded | Two ends of a scale with steps between | hot, warm, cool, cold |
| Complementary | Either one or the other, no middle | alive, dead; on, off |
| Relational | Each needs the other to make sense | buy, sell; parent, child |
| Directional | Opposite movement or position | up, down; arrive, leave |
Graded pairs allow "very" and "slightly": very cold, slightly warm. Complementary pairs do not; nobody is slightly alive. That test helps you choose between a mild antonym and an absolute one.
Building opposites with prefixes
English often forms an antonym by adding a prefix. Each prefix has habits:
- un: happy, unhappy; fair, unfair; lock, unlock.
- in, im, il, ir: visible, invisible; possible, impossible; legal, illegal; regular, irregular.
- dis: agree, disagree; honest, dishonest; like, dislike.
- non: fiction, nonfiction; stop, nonstop.
- mis: understand, misunderstand. This one means wrongly rather than not.
Be careful: inflammable means the same as flammable, both describing something that burns easily. And unhappy is softer than miserable, so a prefix antonym is often the mildest choice.
Antonym examples in sentences
- The shop opens at nine and closes at six.
- Prices tend to increase in winter and decrease in spring. See increase.
- Her first draft was weak, but the final one was strong. See strong.
- He was happy with the grade but sad to leave the class. See happy and sad.
- Our team learned more from one failure than from three successes. See success.
A cover letter line: "I turn complex processes into simple ones." The pair complex and simple gives the reader a before and after in seven words. Contrast built from antonyms is one of the quickest ways to make a claim stick.
Words with more than one opposite
Because words carry several senses, a search for the opposite of a word can return a mixed list. Pick the antonym that matches your meaning.
| Word | Sense | Antonym |
|---|---|---|
| hard | firm to touch | soft |
| hard | difficult | easy |
| old | not young | young |
| old | not new | new |
| fair | just | unfair |
| fair | pale | dark |
Our word pages, such as hard and old, list antonyms for each sense separately for exactly this reason.
Words that are their own opposite
A few English words, sometimes called contronyms, can mean two opposite things. To dust a shelf removes dust, while to dust a cake adds sugar. To sanction can mean to allow or to punish. Left can mean departed or remaining, as in "she left" versus "two cookies are left". Context always settles which sense is meant, but these are worth avoiding when a misreading would cause trouble.
Using antonyms well
Antonyms do more than fill vocabulary quizzes. They help you:
- Define by contrast. Saying frugal is the opposite of wasteful explains it faster than a long definition.
- Avoid negatives. "Not happy" can become unhappy or disappointed, which reads more directly.
- Balance a sentence. Paired opposites give rhythm: easy to start, hard to finish.
For the matching idea on the other side, read what a synonym is, or explore the feelings and emotions hub, where most words come with clear opposites. The home page finder covers both.
Frequently asked questions
What's an antonym of a word, in simple terms?
It is the word that means the opposite. Tall is an antonym of short, and full is an antonym of empty.
Is it what is a antonym or what is an antonym?
Write an antonym. The word begins with a vowel sound, so it takes an, just as you would say an apple.
Does every word have an antonym?
No. Many nouns, such as table or tree, have no opposite, and most linking words have none either. Some words have several, one per sense.
What is the opposite of antonym?
Synonym. A synonym shares a meaning with another word, while an antonym reverses it.
What are antonyms for kids, with examples?
Explain them as opposite words, then use pairs a child can see: big and small, day and night, up and down, wet and dry.
Can a phrase be an antonym?
Yes. Speed up and slow down are opposites, as are turn on and turn off. Phrasal verbs often pair this way, usually by swapping the small word at the end.