"temperamental" in the adjective sense
1. temperamental
relating to or caused by temperament
"temperamental indifference to neatness"
"temperamental peculiarities"
2. moody, temperamental
subject to sharply varying moods
"a temperamental opera singer"
3. erratic, temperamental
likely to perform unpredictably sometimes it would start and sometimes it wouldn't"
"erratic winds are the bane of a sailor"
"a temperamental motor
"that beautiful but temperamental instrument the flute"- Osbert Lancaster
Source: WordNet® (An amazing lexical database of English)
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