Synonyms of unstable in English:

unstable


See definition of unstable

adjective

1‘icebergs are notoriously unstable and may flip over’

SYNONYMS

unsteady, rocky, wobbly, wobbling, rickety, shaky, tottery, tottering, teetering, doddery, unsafe, unbalanced, unreliable, insecure, not secure, unfastened, unsecured, movable, precarious

Irish bockety

ANTONYMS

stable, steady

2‘the country suffered from unstable coffee prices’

SYNONYMS

changeable, volatile, variable, unsettled, fluctuating, inconstant, inconsistent, irregular, fitful, unpredictable, unreliable, fickle, capricious, mercurial, erratic, uncertain, wavering

ANTONYMS

stable, firm

3‘he was mentally unstable’

SYNONYMS

unbalanced, of unsound mind, mentally ill, deranged, demented, crazed, distracted, troubled, disturbed, unhinged, insane, mad, mad as a hatter, mad as a March hare, raving mad, lunatic, out of one's head, out of one's mind, not in one's right mind, neurotic, psychotic

non compos mentis

British sectionable

informal crazy, loopy, loony, mixed up, nuts, nutty, nutty as a fruitcake, bananas, cracked, crackpot, daft, dippy, screwy, bats, batty, dotty, cuckoo, bonkers, potty, mental, screwed up, not all there, off one's head, out to lunch, a bit lacking, round the bend, round the twist, away with the fairies

British informal barmy, crackers, barking, barking mad, off one's rocker, off one's trolley, daft as a brush, not the full shilling

North American informal nutsy, nutso, squirrelly, wacko, buggy

dated touched

ANTONYMS

stable, balanced