Definition of hysterical
1
: of, relating to, or marked by hysteria
hysterical conditions
2
: feeling or showing extreme and unrestrained emotion
hysterical fans … the paper did not hesitate to appeal to racial passions in hysterical headlines and rabid editorials. — The New Yorker
3
informal
: very funny
a hysterical movie/joke
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Merriam-Webster unabridged
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Time Traveler for hysterical
The first known use of hysterical was in 1603
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