The superlative form of canny, meaning the most shrewd, careful, or clever in a cautious way.
From canny (Scottish/Northern English dialect meaning 'careful' or 'wise'), derived from can (to know) plus -y suffix. The superlative adds -est. The word evolved from Old Norse 'kenna' meaning 'to know.'
Canny is a Scottish gem that's still used today to describe people who are smart about saving money or spotting tricks—it's basically the opposite of gullible. The word survived in dialect when it disappeared from standard English, showing how regional speech preserves ancient vocabulary.
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