IPA: /ˈveɪn.ləs/
KK: /ˈvenləs/
Having no veins or lacking veins in structure.
The veinless leaf was smooth and uniform in appearance.
Veinless → It is formed from "vein" (from Old French *veine*, meaning a blood vessel or channel) and "-less" (meaning without). The word "veinless" means without veins or lacking blood vessels.
Think of being 'without' ('-less') blood 'vessels' ('vein') — that's why veinless means lacking veins.