Liberal Dictionary English Dictionary
adjective
- arousing great merriment; extremely funny: a hilarious story; a hilarious old movie.
- boisterously merry or cheerful: a hilarious celebration.
- merry; cheerful.
adjective
- very funny or merry
1823, “cheerful,” from Latin hilaris “cheerful, of good cheer” (see hilarity) + -ous. Meaning “boisterously joyful” is from 1830s. Related: Hilariously.