erratic

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er·rat·ic / iˈratik/ • adj. not even or regular in pattern or movement; unpredictable: her breathing was erratic. ∎  deviating from the normal or conventional in behavior or opinions: neighbors were alarmed by increasingly erratic behavior.• n. (also erratic block or boulder) Geol. a rock or boulder that differs from the surrounding rock and is believed to have been brought from a distance by glacial action.DERIVATIVES: er·rat·i·cal·ly / -(ə)lē/ adv.

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