Synonyms for Unsolvable:

adj.

not easily solved (adjective)
insoluble.

n.

unsolvable (noun)
insolvable, insoluble, unsoluble, unresolvable.

Other synonyms:

adj.
insoluble.
n.
insoluble, insolvable, unresolvable, unsoluble.

Usage examples for unsolvable

  1. " That is the unsolvable mystery," returned Wallace. – The Last of the Plainsmen by Zane Grey
  2. There are problems incident to unfair practices, and to exchanges which madness in money have made almost unsolvable – Complete State of the Union Addresses from 1790 to the Present by Various