The superlative form of 'crawly,' meaning the most crawly, the creepiest, or most likely to give someone a crawling feeling.
From 'crawly' + '-est' (the superlative suffix from Old English). This is the highest degree form of the adjective, following standard English morphology.
The superlative '-est' gives us the most theatrical adjectives: 'crawliest,' 'creepiest,' 'ickiest'—these words naturally sound exaggerated because they're meant to express extremes!
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