IPA: /ˈklaʊdləsli/
KK: /ˈklaʊdləsli/
In a way that is free from clouds; clear and bright, typically referring to the sky.
The sky was cloudlessly blue, perfect for a picnic.
Cloudlessly → It is formed from "cloud" (from Old English "clud", meaning a mass of vapor) and "-less" (meaning without) and the adverbial suffix "-ly" (meaning in a manner). The word "cloudlessly" means in a manner that is without clouds or clear of clouds.
Think of being 'without' ('-less') clouds, which means the sky is clear. This helps you remember that 'cloudlessly' describes a clear sky.