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

See also: insoluble

• bistable
• bister
• bistered
• bistort
• bistoury
• bistre
• bistred
• bistro
• bistroic
• bisulcate
• bisulfate
• bisulphate
• bit
• bit field
• bit part
• bit-by-bit
• bitartrate
• bitch
• bitchery
• bitchiness
• bitchy
• bite
• bite off
• bite out
• bite the bullet