Definition of erratic

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