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temperamental (adj.)

"of or pertaining to temperament," 1640s, from temperament + -al (1); in the sense of "moody" it is recorded from 1907. Related: Temperamentally.

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Definitions of temperamental from WordNet

temperamental (adj.)
relating to or caused by temperament;
temperamental indifference to neatness
temperamental peculiarities
temperamental (adj.)
subject to sharply varying moods;
a temperamental opera singer
Synonyms: moody
temperamental (adj.)
likely to perform unpredictably; "a temperamental motor; sometimes it would start and sometimes it wouldn't"; "that beautiful but temperamental instrument the flute"- Osbert Lancaster;
Synonyms: erratic
From wordnet.princeton.edu