definition of
[erratic]

[1] #1 erratic s. [fickle, mercurial, quicksilver] 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". wn

[2] #2 erratic s. [planetary, wandering] having no fixed course; "an erratic comet"; "his life followed a wandering course"; "a planetary vagabond". wn

[3] #3 erratic s. [temperamental] 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. wn