Webster's English Dictionary

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temperamental

tem.per.a.men.tal \.tem-p(*-)r*-'ment-*l\ \-*l-e-\ aj 1: of, relating to, 
   or arising from temperament : CONSTITUTIONAL <(~ peculiarities} 2a: marked 
   by excessive sensitivity and impulsive changes of mood : H IGH-STRUNG, 
   EXCITABLE {a ~ opera singer} 2b: UNPREDICTABLE, CAPRICIOUS  - 
   tem.per.a.men.tal.ly av