Superlative form of creepy; the most unsettling, eerie, or causing the feeling of skin crawling.
Superlative form of 'creepy' (adjective from 'creep') formed with the suffix '-est' (from Old English, indicating the highest degree). 'Creepy' itself comes from the verb 'creep' meaning slow movement, extended to mean unsettling.
Our instinctive creepiness response evolved to detect predators and threats moving slowly through tall grass—so things that creep toward us trigger ancient survival instincts buried in our brains!
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