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unstable (adj.)

early 13c., "apt to move," from un- (1) "not" + stable (adj.). Similar formation in Middle High German unstabel. Meaning "liable to fall" is recorded from c. 1300; sense of "fickle" is attested from late 13c. An Old English word for this was feallendlic, which might have become *fally.

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Definitions of unstable from WordNet

unstable (adj.)
lacking stability or fixity or firmness;
unstable political conditions
an unstable world economy
the tower proved to be unstable in the high wind
unstable (adj.)
highly or violently reactive;
sensitive and highly unstable compounds
unstable (adj.)
affording no ease or reassurance;
Synonyms: precarious
unstable (adj.)
suffering from severe mental illness;
Synonyms: mentally ill / unsound
unstable (adj.)
disposed to psychological variability;
his rather unstable religious convictions
unstable (adj.)
subject to change; variable;
everything was unstable following the coup
Synonyms: fluid
From wordnet.princeton.edu