Hysterical means "marked by uncontrollable, extreme emotion." If your favorite sports team wins a championship, you might get hysterical and started weeping and screaming all at once.

Hysterical comes from the medical Latin word hystericus, which described a female neurotic condition, thought to be caused by a dysfunction of the uterus. Hysterical is still used today by psychiatrists, though in a broader way, to describe someone suffering from a psychological stress condition. Hysterical can also mean "extremely funny," even more so than hilarious.

Definitions of hysterical
  1. adjective
    characterized by or arising from psychoneurotic hysteria
    “"during hysterical conditions various functions of the human body are disordered"- Morris Fishbein”
    hysterical amnesia”
    synonyms: hysteric
    neurotic, psychoneurotic
    affected with emotional disorder
  2. adjective
    marked by excessive or uncontrollable emotion
    hysterical laughter”
    “a mob of hysterical vigilantes”
    troubled emotionally and usually deeply
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