liable to sudden unpredictable change; erratic behavior; fickle weather; mercurial twists of temperament; a quicksilver character, cool and willful at one moment, utterly fragile the next

[ Syn: fickle , mercurial , quicksilver ]

having no fixed course; an erratic comet; his life followed a wandering course; a planetary vagabond

[ Syn: planetary , wandering ]

likely to perform unpredictably; erratic winds are the bane of a sailor; a temperamental motor; sometimes it would start and sometimes it wouldnt; that beautiful but temperamental instrument the flute- Osbert Lancaster

[ Syn: temperamental ]