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Definition of unstable:

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


perilous, timid, continue, wonky, hazardous, coseismic, firm, unassured, tottering, mobile, bad, smooth, reactive, disturbed, sensitive, rocky, rickety, dubious, rattletrap, unsure, variant, fluid, runny, tippy, various, crank, uncertain, unpredictable, fantastic, parlous, freakish, strong, erratic, infirm, insane, explosive, changeable, equivocal, coseismal, doubtful, capricious, wobbly, change, precarious, unsettled, dizzy, tottery, steady, ticklish, mentally ill, unsound, shaky, fluent, irresolute, touch-and-go, liquid, thin-skinned, tender, giddy, thermolabile, top-heavy, whimsical, unbalanced, uneasy, cranky, fantastical, seismic, inconsistent, volatile, risky, weak, volcanic, fallacious, shifty, unfit, labile, insecure, seismal, temperamental, changeful.

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