Meaning of UNSTABLE in English

UNSTABLE

adj. (unstabler, unstablest) 1 not stable. 2 changeable. 3 showing a tendency to sudden mental or emotional changes. unstable equilibrium a state in which a body when disturbed tends to move farther from equilibrium. unstableness n. unstably adv.

Concise Oxford English dictionary.      Краткий оксфордский словарь английского языка.