Meaning of UNSTABLE in English

UNSTABLE

adj. (unstabler, unstablest)

1. not stable.

2 changeable.

3 showing a tendency to sudden mental or emotional changes.

Phrases and idioms:

unstable equilibrium a state in which a body when disturbed tends to move farther from equilibrium.

Derivatives:

unstableness n. unstably adv.

Oxford English vocab.      Оксфордский английский словарь.