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HILARIOUS definition: 1. extremely funny and causing a lot of laughter: 2. extremely funny and causing a lot of…. Learn more.
Definition of hilarious adjective from the Oxford Advanced Learner's Dictionary. extremely funny. Lynn found the whole situation hilarious. Do you know Pete? He's hilarious.
1. arousing great merriment; extremely funny. 2. boisterously merry or cheerful: feeling hilarious from the champagne.
Hilarious means extremely funny, like literally lol funny. Hilarious is most commonly used to describe someone or something (like a joke or a movie) as super funny. Much less commonly, it used to mean very merry or cheerful, as in a hilarious celebration.
Adjective hilarious (comparative more hilarious, superlative most hilarious) Very funny; causing great merriment and laughter. Synonyms: see Thesaurus: funny a hilarious joke Do you like Monty Python? I think they're hilarious. Full of hilarity; merry.
hi lar i ous ly, adv. WordReference Random House Unabridged Dictionary of American English © 2026 hi lar i ous (hi lâr′ ē əs, -lar′ -, hī-), adj. arousing great merriment; extremely funny: a hilarious story; a hilarious old movie. boisterously merry or cheerful: a hilarious celebration. merry; cheerful.
If something is hilarious, it is extremely funny and makes you laugh a lot. We thought it was hilarious when we first heard about it.
Hilarious refers to something that is extremely funny, causing amusement, laughter or mirth. It can describe an event, situation, person, action or thing that provokes cheerful laughter or is found to be extraordinarily humorous.