Synonyms of erratic

1. erratic, fickle, mercurial, quicksilver(prenominal), changeable (vs. unchangeable), changeful: usage: 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"
2. erratic, planetary, wandering, unsettled (vs. settled): usage: having no fixed course; "an erratic comet"; "his life followed a wandering course"; "a planetary vagabond"
3. erratic, temperamental, unreliable (vs. reliable), undependable (vs. dependable): usage: 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