IPA: /ˈwiːdləs/
KK: /ˈwiːdləs/
Not having any weeds present; free from unwanted plants.
The garden was weedless after the gardener's hard work.
Weedless is formed from "weed" (from Old English *wēod*, meaning a plant that is undesirable or troublesome) and "-less" (meaning without). The word "weedless" means without weeds or free from undesirable plants.
Think of being 'without' ('-less') those troublesome plants ('weed') — that's what weedless means.