1. Lacking or not requiring a key
   "a keyless lock operated by a series of pushbuttons"

Antonym: keyed

Encyclopedia: Keyless

• off the record
• off year
• off your guard
• off-and-on
• off-axis reflector
• off-base
• off-Broadway
• off-center
• off-centered
• off-centre
• off-centred
• off-color
• off-colour
• off-day
• off-guard
• Robert's Rules of Order
• Roberto Francesco Romolo Bellarmine
• Roberts
• Robertson
• Robeson
• Robespierre
• robin
• Robin Goodfellow
• Robin Hood
• robin redbreast