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Meaning of erratic

er•rat•ic

Pronunciation: (i-rat'ik), [key]
— adj.
  1. deviating from the usual or proper course in conduct or opinion; eccentric; queer: erratic behavior.
  2. having no certain or definite course; wandering; not fixed: erratic winds.
  3. noting or pertaining to a boulder or the like carried by glacial ice and deposited some distance from its place of origin.
  4. (of a lichen) having no attachment to the surface on which it grows.
—n.
  1. an erratic or eccentric person.
  2. an erratic boulder or the like.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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