IPA: /ˈskæbiɪst/
KK: /ˈskæbiɪst/
The most covered with scabs or rough patches on the skin.
The dog looked very uncomfortable because it had the scabbiest skin of all the animals at the shelter.
Comparative: scabbier
Superlative: scabbiest
Scabbiest is derived from "scabby" (from Old English "sceabbig", meaning covered with scabs) and the superlative suffix "-est" (meaning most). The word "scabbiest" refers to something that is most covered with scabs or has the most scabby appearance.
Think of something that is 'most covered with scabs' — 'scabby' describes the condition, and '-est' indicates the highest degree.
No commonly confused words.