unstable

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Pronunciation

• IPA: /ʌnˈsteɪbəɫ/

Adjective

unstable

1. Having a strong tendency to change.
2. Fluctuating; not constant.
3. Fickle.
4. Unpredictable.
5. (chemistry) Readily decomposable.
6. (physics) Radioactive, especially with a short half-life.

Synonyms

• (having strong tendency to change) labile
• (fluctuating) instable (rare); see also Thesaurus:unsteady
• (fickle) arbitrary, capricious
• (not held or fixed securely and likely to fall over) tottering, unsteady, wobbly; see also Thesaurus:rickety

Antonyms

• stable

Related terms

• instability
• unstability (rare)

Translations

• French: instable
• German: instabil, labil
• Italian: instabile
• Portuguese: instável
• Russian: неусто́йчивый
• Spanish: inestable

Translations

• French: instable
• Italian: instabile
• Portuguese: instável
• Spanish: inestable, instable

Verb

unstable (unstables, present participle unstabling; past and past participle unstabled)

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

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