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hysterical 
1 berserk, beside oneself, convulsive, crazed, distracted, distraught, frantic, frenzied, mad, overwrought, raving, uncontrollable 
2  (informal) comical, farcical, hilarious, screaming, side-splitting, uproarious, wildly funny 
 
Antonyms  
 
1 calm, composed, poised, self-possessed, unfazed  (informal) 
2 grave, melancholy, sad, serious