adj. 25B6; adjective
he is unbalanced and dangerous : UNSTABLE, mentally ill, deranged, demented, disturbed, unhinged, insane, mad, out of one's mind, non compos mentis; informal crazy, loopy, loony, nuts, nutty, cracked, screwy, batty, dotty, cuckoo, bonkers, mental, off one's head, round the bend/twist; Brit. informal barmy, potty, crackers, barking, off one's rocker; N. Amer. informal nutso, squirrelly; dated touched.
a most unbalanced article : BIASED, prejudiced, one-sided, partisan, inequitable, unjust, unfair, parti pris.
sane, unbiased.