8 letters · 15 points in Scrabble
originEtymology tree Proto-Indo-European *grewbʰ-der. Proto-Germanic *kreupaną Proto-West Germanic *kreupan Old English crēopan Middle English crepen English creep Proto-Indo-European *-kos Proto-Germanic *-gaz Proto-West Germanic *-g Old English -iġ Middle English -y English -y English creepy Middle English -ly English -ly English creepily From creepy + -ly.
Etymology from Wiktionary, CC BY-SA 3.0