An antonym finder that knows which meaning you mean
Most words have more than one meaning, and each meaning can have a different opposite. Hot weather is the opposite of cold weather, but a hot news story is the opposite of a stale one. This antonym finder lists the opposites for every meaning of a word separately, so you can pick the one that fits your sentence.
It uses Princeton’s WordNet 3.1, a lexical database built by linguists, in which opposite pairs are linked by hand. Where WordNet links a word to a similar word instead — “blissful” is similar to happy — the finder follows that link and shows unhappy as an indirect opposite. Words formed with un-, in-, im-, il-, ir-, dis- or non- are added only when they actually exist in the dictionary.
Teachers and students can switch to the Opposites quiz: multiple-choice questions drawn from 265 common antonym pairs, reproducible from a short code so a whole class gets the same quiz.
How to find the opposite of a word
- Type a word in Word — “happy”, “buy”, “early” — and press Find antonyms.
- Start with Best opposites: direct antonyms come first, then indirect ones, prefix forms and near opposites.
- Check the meaning lists below to see which opposite belongs to which sense of the word.
- Click any opposite to look up its own opposites, or press Copy opposites to copy the list.
- For practice, choose Opposites quiz, set the number of questions, and share the quiz code.
Antonym Finder features
Opposites per meaning
Each meaning of the word gets its own row, so the 21 adjective senses of “hot” do not blur into one list.
Direct and indirect antonyms
Direct pairs are linked explicitly in WordNet; indirect ones go through a similar word, and near opposites are the words similar to the opposite.
Prefix forms that really exist
un-, in-, im-, il-, ir-, dis- and non- forms appear only if WordNet lists them with the same part of speech; look-alikes such as invaluable are excluded.
Word forms understood
Type “happier” or “bought” and the finder works from happy or buy, and says so.
Seeded quiz for classes
Five, ten or twenty questions with four choices each; the same code always produces the same quiz, and the answer key can be copied.
Direct, indirect and prefix antonyms
| Kind | Example | Where it comes from |
|---|---|---|
| Direct antonym | happy ↔ unhappy, buy ↔ sell | A pair linked in WordNet for that exact meaning |
| Indirect | blissful → unhappy | The word is similar to happy, whose direct opposite is unhappy |
| Through a synonym | possible (“existing in possibility”) → actual | Another word with the same meaning (potential) has the opposite |
| Prefix form | regular → irregular, lock → unlock | Prefix + word exists in WordNet with the same part of speech |
| Near opposite | happy → miserable | A word WordNet lists as similar to the direct opposite |
Worked example: “happy”
WordNet has four adjective meanings for happy. The first, “enjoying or showing or marked by joy or pleasure”, has the direct antonym unhappy. The other three borrow opposites through similar words: “marked by good fortune” is similar to fortunate (opposite unfortunate), “eagerly disposed to act” to willing (unwilling), and “well expressed” to felicitous (infelicitous). The near opposites lovesick, miserable and suffering are words WordNet lists as similar to unhappy.
For a fuller range of alternatives to any of these words, the Synonym Finder lists hundreds of related terms, and the Word Definition Tool shows every meaning with examples.
Watch out for false opposites
- Inflammable means the same as flammable, not the opposite — use nonflammable.
- Invaluable means extremely valuable; the opposite of valuable is worthless.
- Infamous means famous for something bad, not unknown.
- Disinterested means impartial (“unaffected by self-interest”); the opposite of interested in the everyday sense is uninterested, so the finder leaves disinterested out.
- Many nouns have no true opposite (dog, table, river). Opposites live mostly among adjectives, adverbs and some verbs.
Antonym Finder FAQ
How do I find the opposite of a word?
Type it into the antonym finder and press Find antonyms. The best opposites are listed first, and each meaning of the word shows its own opposite.
Why does a word have several antonyms?
Because it has several meanings. “Hot” food is opposite to mild food, a “hot” stolen car to a legal one. The finder keeps those meanings apart.
What is an indirect antonym?
A word that is opposite through a similar word. WordNet links “blissful” to happy, and happy to unhappy, so unhappy is an indirect antonym of blissful.
Can I add un- or dis- to make an antonym?
Only if the result is a real word with the opposite meaning. The finder shows prefix forms that exist in WordNet and flags those it has not confirmed as antonyms, so check the definition shown beside them.
How does the quiz code work?
The code seeds a random-number generator, so the same code, word set and number of questions always produce the same quiz. Give your class the code; press New code for a fresh quiz.
Is it free and private?
Yes. The word list is downloaded from this site in small parts and searched in your browser; nothing you type is sent anywhere.