Synonyms of unstable in English:
3 he was mentally unstable
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 mind/head, not in one's right mind, neurotic, psychotic;
Latin non compos mentis;
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/twist, away with the fairies
British informal barmy, crackers, barking, barking mad, off one's trolley/rocker, daft as a brush, not the full shilling
[Antonyms] stable, balanced
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