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[hi-lair-ee-uh s, -lar-, hahy-] /hɪˈlɛər i əs, -ˈlær-, haɪ-/
arousing great merriment; extremely funny:
a hilarious story; a hilarious old movie.
boisterously merry or cheerful:
a hilarious celebration.
merry; cheerful.
Origin of hilarious
1815-25; < Latin hilar(is), hilar(us) cheerful (< Greek hilarós) + -ious
Related forms
hilariously, adverb
hilariousness, noun
hyperhilarious, adjective
hyperhilariously, adverb
hyperhilariousness, noun
unhilarious, adjective
unhilariously, adverb
unhilariousness, noun
2. lively, jolly, rollicking, high-spirited.
2. sad, serious, solemn. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for hilarious
  • People who aren't funny at all think they are hilarious.
  • It's hilarious that that's what you chose to respond to.
  • The author never minces words, and the result is gross, hilarious and true-to-life.
  • He alternates hilarious monologs with clerver songs, nearly all on a high laugh level.
  • The path has been strewn with anxious moments and hilarious encounters.
  • This is among your most hilarious assumptions.
  • The double entendres were absolutely hilarious!
  • Her personal tale is a mix of the ordinary, the tragic, the hilarious.
  • On the bright side, watching your soon-to-be former colleagues feign a casual demeanor can be hilarious.
  • It was hilarious but not that well received.
British Dictionary definitions for hilarious


very funny or merry
Derived Forms
hilariously, adverb
hilariousness, noun
Word Origin
C19: from Latin hilaris glad, from Greek hilaros
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for hilarious

1823, "cheerful," from Latin hilaris "cheerful, of good cheer" (see hilarity) + -ous. Meaning "boisterously joyful" is from 1830s. Related: Hilariously.

Online Etymology Dictionary, © 2010 Douglas Harper
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