adjective
admitting of no solution
seemingly insoluble problems faced the city council
Synonyms: inextricable, insolvable, irresoluble, irresolvable, unsoluble, unsolvable
Related Word: inexplicable, unexplainable; inconceivable, unaccountable; mysterious
Contrasted words: answerable, explicable, understandable; resolvable; clear, plain, straightforward
Antonyms: soluble, solvable