1. Having no cause or apparent cause
   "we cannot regard artistic invention as...uncaused and unrelated to the times"
   - causeless, fortuitous

See also: unintended

• well-tried
• well-turned
• well-versed
• well-wisher
• well-wishing
• well-worn
• wellbeing
• wellborn
• wellerism
• Welles
• wellhead
• wellie
• wellington
• Wellington boot
• wellness
• wellpoint
• Wells
• wellspring
• welly
• welsh
• Welsh Black
• Welsh corgi
• Welsh dresser
• Welsh onion
• Welsh pony