IPA: /ˈrɒk.ləs/
KK: /ˈrɑk.ləs/
Having no rocks; free from stones or boulders.
The hikers enjoyed a rockless path that made their journey easier.
Rockless → It is formed from "rock" (from Old English "rocc", meaning a large stone or boulder) and "-less" (meaning without). The word "rockless" means without rocks or stones.
Think of being 'without' ('-less') 'rocks' — that's why rockless means lacking rocks.