gearless
/ˈɡɪər.ləs/Definitions
1. adjective
not using or equipped with gears
“The bicycle is gearless, making it ideal for short trips.”
2. adjective
not relying on or using mechanical gears
“The city’s public transportation system is gearless, relying on electricity instead.”
3. adjective
lacking or not having gears
“The new gearless engine design is more efficient and environmentally friendly.”