temperamental (Adjective) — Relating to or caused by temperament. ex. "temperamental indifference to neatness" ex. "temperamental peculiarities"
temperamental (Adjective) — Subject to sharply varying moods. ex. "a temperamental opera singer"
temperamental (Adjective) — Likely to perform unpredictably. ex. "a temperamental motor; sometimes it would start and sometimes it wouldn't" ex. "that beautiful but temperamental instrument the flute"