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WordReference Random House Learner's Dictionary of American English © 2024er•rat•ic /ɪˈrætɪk/USA pronunciation adj. - changeable in behavior or style;
unpredictable:behavior too erratic to trust.
er•rat•i•cal•ly, adv. WordReference Random House Unabridged Dictionary of American English © 2024er•rat•ic (i rat′ik),USA pronunciation adj. - deviating from the usual or proper course in conduct or opinion;
eccentric;
queer:erratic behavior. - having no certain or definite course;
wandering;
not fixed:erratic winds. - Geologynoting or pertaining to a boulder or the like carried by glacial ice and deposited some distance from its place of origin.
- Fungi(of a lichen) having no attachment to the surface on which it grows.
n. - an erratic or eccentric person.
- Geologyan erratic boulder or the like.
- Latin errāticus, equivalent. to errāt(us) (past participle of errāre to err) + -icus -ic
- Middle English 1325–75
- 1.See corresponding entry in Unabridged unpredictable, unstable, capricious.
- 1.See corresponding entry in Unabridged consistent, regular, stable.
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