creepiness

Etymology 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
Proto-Germanic *-in-
Proto-Indo-European *-h₂
Proto-Indo-European *-éh₂
Proto-Indo-European *-yéti
Proto-Indo-European *-eh₂yéti
Proto-Indo-European *-h₂ti
Proto-Germanic *-ōną
Proto-Germanic *-inōną
Proto-Indo-European *-dyé-
Proto-Germanic *-atjaną
Proto-Indo-European *-tus
Proto-Germanic *-þuz
Proto-Germanic *-assuz
Proto-Germanic *-inassuz
Proto-West Germanic *-nassī
Old English -nes
Middle English -nesse
English -ness
English creepiness
From creepy + -ness.