Adjective erratic has 3 senses
  1. erratic, planetary, wandering - having no fixed course; "an erratic comet"; "his life followed a wandering course"; "a planetary vagabond"
    Antonym: settled (indirect, via unsettled)
  2. erratic, 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"
    Antonym: unchangeable (indirect, via changeable)
  3. erratic, 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
    Antonyms: reliable, dependable (indirect, via unreliable, undependable)
    Antonyms: reliable, dependable (indirect, via unreliable, undependable)
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