One of the mysteries of the English language finally explained.
1‘icebergs are notoriously unstable and may flip over’
unsteady, rocky, wobbly, wobbling, rickety, shaky, tottery, tottering, teetering, doddery, unsafe, unbalanced, unreliable, insecure, not secure, unfastened, unsecured, movable, precarious
2‘the country suffered from unstable coffee prices’
changeable, volatile, variable, unsettled, fluctuating, inconstant, inconsistent, irregular, fitful, unpredictable, unreliable, fickle, capricious, mercurial, erratic, uncertain, wavering
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 head, out of one's mind, not in one's right mind, neurotic, psychotic
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, 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
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