One of the mysteries of the English language finally explained.
mad, insane, out of one's mind, deranged, demented, not in one's right mind, certifiable, of unsound mind, crazed, lunatic, unbalanced, unhinged, unstable, disturbed, frenzied, raving, distraught, mad as a hatter, mad as a March hare
non compos mentis
crazy, mental, off one's head, out of one's head, off one's nut, nuts, nutty, nutty as a fruitcake, off one's rocker, not right in the head, not quite right in the head, raving mad, bats, batty, bonkers, cuckoo, loopy, loony, bananas, loco, dippy, screwy, touched, gaga, doolally, up the pole, not all there, out to lunch, not right upstairs, away with the fairies
British barmy, crackers, barking, barking mad, round the twist, off one's trolley, as daft as a brush, not the full shilling, two sandwiches short of a picnic
North American buggy, off the wall, nutsy, nutso, out of one's tree, meshuga, squirrelly, wacko, gonzo
Canadian NZ Australian bushed
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