"darnedest" in the adjective sense
1. blasted, blame, blamed, blessed, damn, damned, darned, deuced, goddam, goddamn, goddamned, infernal
expletives used informally as intensifiers
"he's a blasted idiot"
"it's a blamed shame"
"a blame cold winter"
"not a blessed dime"
"I'll be damned (or blessed or darned or goddamned) if I'll do any such thing"
"he's a damn (or goddam or goddamned) fool"
"a deuced idiot"
"an infernal nuisance"
Source: WordNet® (An amazing lexical database of English)
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