1. Occurring without motivation or provocation
   "motiveless malignity"
   - unprovoked, wanton

See also: unmotivated

• life-giving
• life-of-man
• life-or-death
• life-sized
• life-support
• life-support system
• life-sustaining
• life-threatening
• lifeblood
• lifeboat
• lifeguard
• lifehack
• lifeless
• lifelessly
• lifelessness
• lifelike
• lifeline
• lifelong
• lifer
• lifesaver
• lifesaving
• lifesize
• lifespan
• lifestyle
• lifetime