• of or pertaining to hysteria; suffering from hysteria; characterized by uncontrollable emotional outbursts; very funny, hilarious (slang)
• someone who is hysterical is in a state of uncontrolled excitement, anger, or panic, as a result of a shock or unpleasant experience.
• hysterical laughter is loud and uncontrolled.
• if you describe something as hysterical, you mean that it is extremely funny; an informal use.
• temper tantrum, uncontrolled emotional display
• uncontrolled laughter