- deviating from the usual or proper course in conduct or opinion; eccentric: erratic behavior.
- inconsistent, irregular, or unpredictable: Many factors affect purchasing power, such as inflation and erratic swings in the stock market.
- having no certain or definite course or pattern; wandering; not fixed: erratic winds.
- noting or pertaining to a boulder or the like carried by glacial ice and deposited some distance from its place of origin.
- (of a lichen) having no attachment to the surface on which it grows.
- an erratic or eccentric person.
- an erratic boulder or the like.
- irregular in performance, behaviour, or attitude; inconsistent and unpredictable
- having no fixed or regular course; wandering
- a piece of rock that differs in composition, shape, etc, from the rock surrounding it, having been transported from its place of origin, esp by glacial action
- an erratic person or thing
