The superlative form of 'darned,' used to express surprise or emphasis about something remarkable or unexpected.
Derived from 'darn,' a euphemistic alteration of 'damn' that became popular in the 18th century to avoid blasphemy. The '-ed' suffix creates the past participle, and '-est' forms the superlative, meaning the most extreme version of being damned or remarkable.
People invented 'darn' as a polite replacement for 'damn,' but it's technically a made-up word with no etymological connection—it's pure creativity! Your great-grandparents used 'darnedest' to sound proper while still expressing frustration, making it one of language's clever workarounds.
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