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

See also: insoluble

Encyclopedia: Insolvable

• strategic intelligence
• strategic warning
• strategical
• strategically
• strategics
• strategist
• strategy
• Stratford
• Stratford-on-Avon
• Stratford-upon-Avon
• strath
• strathspey
• stratification
• stratified
• stratified language
• stratified sample
• stratified sampling
• stratiform
• stratify
• stratigraphy
• stratocracy
• stratocumulus
• stratosphere
• stratospheric
• stratum