IPA: /ˈreɪn.ləs/
KK: /ˈreɪnləs/
Not having any rain; dry.
The weather was warm and rainless, perfect for a picnic.
Rainless → It is formed from "rain" (from Old English *regn*, meaning precipitation) and "-less" (meaning without). The word "rainless" means without rain or lacking precipitation.
Think of being 'without' ('-less') 'rain' — that's why rainless means there is no rain.