1. Not easily solved
   "public finance...had long presented problems unsolvable or at least unsolved"
   - insolvable, unsoluble, unresolvable

See also: insoluble

• fruit bat
• fruit cocktail
• fruit compote
• fruit crush
• fruit custard
• fruit drink
• fruit fly
• fruit grower
• fruit juice
• fruit machine
• fruit of the poisonous tree
• fruit punch
• fruit salad
• fruit sugar
• fruit tree
• fruit-eating
• fruitage
• fruitarian
• fruitcake
• fruiterer
• fruitful
• fruitfully
• fruitfulness
• fruitiness
• fruiting