[adjective] having no fixed course; "an erratic comet"; "his life followed a wandering course"; "a planetary vagabond" Synonyms:planetary, wandering
[adjective] 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" Synonyms:fickle, mercurial, quicksilver
[adjective] 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 Synonyms:temperamental
