In a wary or cautious manner; with careful attention to potential risks or dangers.
From Middle English 'chare' (to turn or twist) combined with '-ly' adverbial suffix. The root traces to Old English 'cerran' meaning to turn, eventually developing the sense of caution or wariness in behavior.
This word almost disappeared from English but survives in the related 'chary' and 'warily.' It shows how adverbs built from verbs of movement (like 'turn') can evolve meanings related to mental states—your body's careful turning becomes your mind's careful thinking.
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