The comparative form of 'crawly,' meaning more crawly, more creepy, or more likely to cause a crawling sensation.
From 'crawly' (the base adjective) + '-er' (the comparative suffix from Old English). This follows standard English patterns for comparing adjectives.
The '-ier' comparative is so satisfying—'crawlier' sounds creepier just by adding that sound, which is a great example of phonetic symbolism where words sound like their meaning!
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