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Adjective: temperamental  ,tem-pru'men-tul
  1. Relating to or caused by temperament
    "temperamental indifference to neatness"; "temperamental peculiarities"
     
  2. Subject to sharply varying moods
    "a temperamental opera singer";
    - moody
     
  3. Likely to perform unpredictably
    "a temperamental motor; sometimes it would start and sometimes it wouldn't"; "that beautiful but temperamental instrument the flute";
    - erratic

See also: emotional, undependable, unreliable

Encyclopedia: Temperamental