temperamental (
http://definr.com/temperamental)
adj 1: relating to or caused by temperament; "temperamental
indifference to neatness"; "temperamental
peculiarities"
2: subject to sharply varying moods; "a temperamental opera
singer" [syn:
moody]
3: 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
[syn:
erratic]