IPA: /ˈkʌv.ə.ləs/
KK: /ˈkʌvərləs/
Not having a protective or decorative outer layer.
The book was left coverless on the table, exposing its pages to dust.
Coverless → It is formed from "cover" (from Old French *couvrer*, meaning to cover or conceal) and "-less" (meaning without). The word "coverless" means without a cover or lacking a protective layer.
Think of something that is 'without' ('-less') a 'cover' — that's why coverless means lacking a cover.