unbalanced

adjective

1 he was considered unbalanced and dangerous:

unstable, of unsound mind, mentally ill, deranged, demented, crazed, troubled, disturbed, unhinged, insane, mad, mad as a hatter, mad as a March hare, raving mad, out of one's mind, 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, dippy, screwy, with a screw loose, cuckoo, bonkers, mental, screwed up, not all there, off one's head, out of one's head, out to lunch, a bit lacking, round the bend;

British sectionable;

British, informal daft, barmy, crackers, barking, barking mad, batty, dotty, potty, off one's trolley, off one's rocker, daft as a brush, not the full shilling, round the twist, away with the fairies;

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

dated touched.

▷antonyms balanced, stable, sane.

2 a most unbalanced article on a fundamental topic:

biased, prejudiced, skewed, one-sided, lopsided, partisan, factional, partial, inequitable, unjust, unfair, uneven, unequal;

French parti pris.

▷antonyms balanced, unbiased, fair.

unbalanced Oxford Dictionary of English