Superlative form of foxy; most fox-like, most cunning, most sly, or most attractive and playful.
From 'foxy' plus the superlative suffix '-est,' completing the three-degree comparison of the adjective.
The superlative '-est' actually comes from Old English and Germanic languages, which is why English speakers still naturally say 'fastest' instead of 'most fast'—our stone-age grammar never got replaced.
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