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Adjective: erratic  i'ra-tik
  1. Liable to sudden unpredictable change
    "erratic behaviour";
    - fickle, mercurial, quicksilver
  2. Having no fixed course
    "an erratic comet";
    - planetary, wandering
  3. Likely to perform unpredictably
    "erratic winds are the bane of a sailor";
    - temperamental
Noun: erratic  i'ra-tik
  1. (geology) a boulder of rock that differs from the surrounding bedrock because it has been transported by a glacier

Derived forms: erratics

See also: changeable, changeful, flakey [informal], flaky [informal], undependable, unreliable, unsettled

Encyclopedia: Erratic