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;
Latinnon compos mentis;
informalraving 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 informalcrackers, barmy, barking, barking mad, off one's trolley, round the twist, as daft as a brush, not the full shilling
Canadian & Australian/New Zealand informalbushed
New Zealand informalporangi
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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