unable to control your behaviour or emotions because you are very upset, afraid, excited etc:
Janet became hysterical and began screaming.
Everyone in the studio burst into hysterical laughter.
extremely funny [= hilarious]:
It was absolutely hysterical! I've never laughed so much.
—hysterically adverbWORD FOCUS: funny
similar words: amusing, humorous, witty, comical
very funny: hilarious, hysterical
something that someone says that is intended to make people laugh: joke, pun, play on wordsfunny
➔ See also funny