IPA: /ˈwɔːrtləs/
KK: /ˈwɔrtləs/
Having a smooth surface without any bumps or growths.
The gardener was pleased to see that the plant was wartless and healthy.
Wartless → It is formed from "wart" (from Old English "wyrt", meaning a growth or excrescence) and "-less" (meaning without). The word "wartless" means without warts or blemishes.
Think of being 'without' ('-less') any 'growths' ('wart') — that's why wartless means free from warts.