erratic

Adjective
  1. Liable to sudden unpredictable change (synset 300346106)
    "erratic behavior"; "fickle weather"; "mercurial twists of temperament"; "a quicksilver character, cool and willful at one moment, utterly fragile the next"
  2. Having no fixed course (synset 302134890)
    "an erratic comet"; "his life followed a wandering course"; "a planetary vagabond"
  3. Likely to perform unpredictably (synset 300728671)
    "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"

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