IPA: /ˈɡɪr.ləs/
KK: /ˈɡɪr.ləs/
Not having any gears or gear mechanisms.
The new bike model is gearless, making it easier to ride uphill.
Gearless → It is formed from "gear" (from Old English *gier*, meaning a mechanism or apparatus) and "-less" (meaning without). The word "gearless" means without gears or mechanisms.
Think of being 'without' ('-less') any 'mechanism' ('gear') — that's why gearless means lacking gears.