IPA: /ˈklaʊdləs/
KK: /ˈklaʊdləs/
Having no clouds in the sky; clear and bright.
The sky was cloudless, allowing us to see the stars clearly at night.
Cloudless → It is formed from "cloud" (from Old English "clud", meaning a mass of vapor or mist) and "-less" (meaning without). The word "cloudless" means without clouds or clear of clouds.
Think of a sky that is 'without' ('-less') any 'clouds' — that's what cloudless means.