Antonyms for stable

all:

unstable.

constant, fixed; resistant:

unprotected, indefinite, shaky, impermanent, ephemeral, unsound, insecure, changing, flexible, unfixed, loose, wobbly, unreliable, different, soft, unstable, temporary, weak, broken, changeable, undependable, imbalanced, irresolute, untrustworthy, inconstant, unsafe, intermittent, vulnerable.

noun:

distraught, crazed, delirious, disturbed, ballistic, scatty, fixated, depressed, raving, berserk, evanescent, witless, eccentric, psychotic, dotty, deranged, monomaniac, distracted, unsubstantial, fleeting, aberrant, open-ended, unreasonable, balmy, mixed-up, moonstruck, hysterical, odd, crazy, foolish, ape, tipsy, infirm, momentary, fruity, loco, daft, strange, nutty, maniacal, Daffy, transitory, paranoiac, mad, potty, cuckoo, pixilated, certifiable, imbalanced, senseless, batty, off, cracked, neurotic, paranoid, weak, lunatic, schizophrenic, insane, kaleidoscopic, amok, nuclear, despondent, unspecified, wacko, mental, screwy, bughouse, oddball, crackpot, ephemeral, demented, psycho, delusional, irrational, disordered, negotiable, loony, delusionary, bananas, monomaniacal, brainsick, obsessed, haywire, gaga, crackbrained, obsessive-compulsive, reactive, transient, phantasmagoric, frantic, loopy, nuts, frenzied, meshuga, indefinite, wacky, schizoid.