unprovable
1. [ adjective ] not provable
Examples:

"it was both unproved and unprovable"

Related terms: unobvious
Similar spelling:   unprofitable
  unprocurable
  unpreventable
  unproven
  unproved
  unprintable
  unbreakable
  unprovoked
  unproblematic
  unbridgeable
  unprofitably
  unportable
  unbearable
  unforgivable