| bonkers | (adjective) informal or slang terms for mentally irregular | Synonyms: around the bend, balmy, barmy, bats, batty, buggy, cracked, crackers, daft, dotty, fruity, haywire, kookie, kooky, loco, loony, loopy, nuts, nutty, round the bend, wacky, whacky |
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| cankerous | (adjective) having an ulcer or canker | Synonyms: ulcerated, ulcerous |
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| cantankerous | (adjective) having a difficult and contrary disposition | Synonyms: crotchety, ornery |
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| (adjective) stubbornly obstructive and unwilling to cooperate | Synonyms: bloody-minded |