definition of
temperamental

[1] #1 temperamental a. relating to or caused by temperament; "temperamental indifference to neatness"; "temperamental peculiarities". wn

[2] #2 temperamental s. [moody] subject to sharply varying moods; "a temperamental opera singer". wn

[3] #3 temperamental s. [erratic] likely to perform unpredictably; "erratic winds are the bane of a sailor"; "a temperamental motor; sometimes it would start and sometimes it wouldn't"; "that beautiful but temperamental instrument the flute"- Osbert Lancaster. wn