The meaning of HILARIOUS is marked by or causing hilarity : extremely funny. How to use hilarious in a sentence.

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.

Mar 18, 2026 · 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 …

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. He had a fund of hilarious tales on the subject.

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 …

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 …

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 …

Factsheet What does the adjective hilarious mean? There are three meanings listed in OED's entry for the adjective hilarious. See ‘Meaning & use’ for definitions, usage, and quotation evidence.