IPA: /ˈʃeɪdləs/
KK: /ˈʃeɪdləs/
Not having any shade; fully exposed to sunlight or lacking color variations.
The garden was shadeless, making it very hot during the summer.
Shadeless is formed from "shade" (from Old English *sceadu*, meaning shadow or shade) and "-less" (meaning without). The word describes a state of being without shade or shadow.
Think of being 'without' ('-less') any 'shadow' ('shade') — that's what shadeless means.