[hi-lair-ee-uhs, -lar-, hahy-]
See more synonyms for hilarious on Thesaurus.com
  1. arousing great merriment; extremely funny: a hilarious story; a hilarious old movie.
  2. boisterously merry or cheerful: a hilarious celebration.
  3. 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

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Antonyms for hilarious

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for hilariously

Contemporary Examples of hilariously

Historical Examples of hilariously

  • The men were happy, not hilariously so, but in a placid, equable fashion.

    The Long Roll

    Mary Johnston

  • Then he laughed again, hilariously, uproariously, and not for long.

    Reels and Spindles

    Evelyn Raymond

  • He had met him on the street and clapped him hilariously on the shoulder.

  • Why had he pointed to the garden and laughed so hilariously?

    Hushed Up

    William Le Queux

  • Hilariously they carried him into the room and dumped him down.

    Stover at Yale

    Owen Johnson

British Dictionary definitions for hilariously


  1. 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 hilariously



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