unstable
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About Our Definitions: All forms of a word (noun, verb, etc.) are now displayed on one page.un·sta·ble
adjective \-ˈstā-bəl\Definition of UNSTABLE
: not stable : not firm or fixed : not constant: as a : not steady in action or movement : irregular <an unstable pulse> b : wavering in purpose or intent : vacillating c : lacking steadiness : apt to move, sway, or fall <an unstable tower> d (1) : liable to change or alteration <an unstable economy> <unstable weather> (2) : readily changing (as by decomposing) in chemical or physical composition or in biological activity e : characterized by lack of emotional control
— un·sta·ble·ness noun
— un·sta·bly \-b(ə-)lē\ adverb
See Examples of UNSTABLE
- an unstable nuclear reactor core
- <the minute we put the books down on the unstable desk, the whole stack went crashing to the floor>
First Known Use of UNSTABLE
13th century
Related to UNSTABLE
- Synonyms
- unbalanced, unsteady
- Antonyms
- balanced, equilibrated, stabilized, stable, steady
See Synonym Discussion at inconstant
un·sta·ble
adjective \-ˈstā-bəl\ (Medical Dictionary)Medical Definition of UNSTABLE
: not stable: as a : characterized by frequent or unpredictable changes <a patient in unstable condition> b : readily changing (as by decomposing) in chemical composition or biological activity <unstable compounds> c : characterized by lack of emotional control or stability
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