Unstable

Synonyms Unsteady, wobbly, rickety, tottery, teetering, unsafe, unreliable, not secure, unsecured, precarious, rocky, wobbling, shaky, tottering, doddery, unbalanced, insecure, unfastened, movable, and bockety.

Synonyms Changeable, variable, fluctuating, inconsistent, fitful, unreliable, capricious, erratic, wavering, volatile, unsettled, inconstant, irregular, unpredictable, fickle, mercurial, uncertain, and peaky.

Synonyms Unbalanced, mentally ill, demented, distracted, disturbed, insane, mad as a hatter, raving mad, out of one's mind/head, neurotic, non compos mentis, crazy, loony, nuts, nutty as a fruitcake, cracked, dippy, bats, bonkers, screwed up, off one's head, a bit lacking, daft, crackers, barking mad, dotty, off one's trolley/rocker, not the full shilling, away with the fairies, nutso, wacko, touched, of unsound mind, deranged, crazed, troubled, unhinged, mad, mad as a March hare, lunatic, not in one's right mind, psychotic, sectionable, loopy, mixed up, nutty, bananas, crackpot, screwy, cuckoo, mental, not all there, out to lunch, round the bend, barmy, barking, batty, potty, daft as a brush, round the twist, nutsy, squirrelly, and buggy.