Synonyms of insane in English:
1 she was examined by three doctors and declared insane
mad, mad as a hatter, mad as a March hare, deranged, demented, out of one's mind, out of one's head, not in one's right mind, sick in the head, unhinged, unbalanced, unstable, disturbed, crazed, crazy, hysterical;
Latin non compos mentis;
informal raving mad, stark staring/raving mad, away with the fairies, not all there, bonkers, cracked, batty, bats, cuckoo, loony, loopy, nuts, nutty, nutty as a fruitcake, screwy, bananas, off one's rocker, off one's head, off one's chump, off one's nut, off the wall, round the bend
British informal crackers, barmy, barking, barking mad, off one's trolley, round the twist, as daft as a brush, not the full shilling
Canadian & Australian/New Zealand informal bushed
New Zealand informal porangi
2 he made an insane suggestion
extremely foolish, idiotic, stupid, silly, senseless, nonsensical, pointless, absurd, ridiculous, ludicrous, farcical, laughable, preposterous, weird, bizarre, fatuous, inane, imbecilic, moronic, asinine, mindless, hare-brained, half-baked, ill-conceived;
impracticable, untenable, implausible, unreasonable, irrational, illogical, unrealistic, unthinkable
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