1. Not easily solved
   "an apparently insolvable problem"
   - unsoluble, unsolvable, unresolvable

See also: insoluble

Encyclopedia: Insolvable

• coral snake
• coral tree
• coral vine
• coral-red
• coral-root bittercress
• coralbells
• coralberry
• coralline
• coralloid
• Corallorhiza
• Corallorhiza maculata
• Corallorhiza striata
• Corallorhiza trifida
• coralroot
• coralwood
• coralwort
• corban
• corbel
• corbel arch
• corbel step
• corbeled
• corbelled
• Corbett
• corbie
• corbie gable