[hi-lair-ee-uhs, -lar-, hahy-]


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 formshi·lar·i·ous·ly, adverbhi·lar·i·ous·ness, nounhy·per·hi·lar·i·ous, adjectivehy·per·hi·lar·i·ous·ly, adverbhy·per·hi·lar·i·ous·ness, nounun·hi·lar·i·ous, adjectiveun·hi·lar·i·ous·ly, adverbun·hi·lar·i·ous·ness, noun

Synonyms for hilarious

Antonyms for hilarious

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for hilarious

Contemporary Examples of hilarious

Historical Examples of hilarious

  • He in turn gives way to the hilarious buffoonery of the two slaves.

    The Dramatic Values in Plautus

    Wilton Wallace Blancke

  • The old lady began to seem to him a thought too discursive, if not hilarious.

    Tiverton Tales

    Alice Brown

  • All Doctor Eben's friends were hilarious; and the greater part of Hetty's were gloomy.

  • The moderator had some difficulty in restoring order to the hilarious meeting.

    Cy Whittaker's Place

    Joseph C. Lincoln

  • All were hugely amused, but one, Mr. Pulcifer, was hilarious.

    Galusha the Magnificent

    Joseph C. Lincoln

British Dictionary definitions for hilarious



very funny or merry
Derived Formshilariously, adverbhilariousness, noun

Word Origin for hilarious

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

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