er·rat·ic ( -r t k)adj. 1. Having no fixed or regular course; wandering. 2. Lacking consistency, regularity, or uniformity: an erratic heartbeat. 3. Deviating from the customary course in conduct or opinion; eccentric: erratic behavior. [Middle English erratik, from Old French erratique, from Latin err  ticus, from errre, to wander; see ers- in Indo-European roots.]er·rat i·cal·ly adv.er·rat i·cism (--sz  m) n. |
erraticism
an action or behavior that deviates from the norm; unpredictability in behavior.
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