IPA: /ˈsæd.əl.əs/
KK: /ˈsædələs/
Not having a saddle, which is a supportive seat for a rider on an animal, typically a horse.
The saddleless horse was free to roam without any burden.
Saddleless → It is formed from "saddle" (from Old English *sadol*, meaning a seat for riding) and "-less" (meaning without). The word "saddleless" means without a saddle.
Think of being 'without' ('-less') a 'seat for riding' ('saddle') — that's what saddleless means.