IPA: /ˈdjuːləs/
KK: /djuːləs/
Not having any moisture or dew on the surface.
The grass was dewless in the early morning sun.
Dewless is formed from "dew" (from Old English *deaw*, meaning moisture or condensation) and "-less" (meaning without). The word "dewless" means without dew or lacking moisture.
Think of 'dew' as moisture and '-less' meaning without — so dewless describes a state of being without moisture.