UNSTABLE

fluid, unstable

(adjective) subject to change; variable; “a fluid situation fraught with uncertainty”; “everything was unstable following the coup”

precarious, unstable

(adjective) affording no ease or reassurance; “a precarious truce”

unstable

(adjective) highly or violently reactive; “sensitive and highly unstable compounds”

unstable

(adjective) disposed to psychological variability; “his rather unstable religious convictions”

unstable

(adjective) lacking stability or fixity or firmness; “unstable political conditions”; “the tower proved to be unstable in the high wind”; “an unstable world economy”

Source: WordNet® 3.1

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Etymology

Adjective

unstable (comparative more unstable, superlative most unstable)

Having a strong tendency to change.

Fluctuating; not constant.

Fickle.

Unpredictable.

(chemistry) Readily decomposable.

(physics) Radioactive, especially with a short half-life.

Synonyms

• (having strong tendency to change): labile

• (fluctuating, not constant): instable (rare); see also unsteady

• (fickle): arbitrary, capricious

• (not held or fixed securely and likely to fall over): tottering, unsteady, wobbly; see also rickety

Antonyms

• stable

Verb

unstable (third-person singular simple present unstables, present participle unstabling, simple past and past participle unstabled)

(transitive) To release (an animal) from a stable.

Anagrams

• abluents, ant-blues, bleaunts, blue ants, tunables, unablest

Source: Wiktionary

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Un*sta"ble, a. Etym: [Cf. Instable.]

Definition: Not stable; not firm, fixed, or constant; subject to change or overthrow.

– Un*sta"ble*ness, n. Chaucer. Unstable equilibrium. See Stable equilibrium, under Stable.

Source: Webster’s Unabridged Dictionary 1913 Edition

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