unconquerable
1. [ adjective ] not capable of being conquered or vanquished or overcome
Examples:

"a tribute to his courage...and his unconquerable will"- R.E.Danielson "faced unconquerable difficulties"

Related terms: conquerable all-victorious invincible insuperable all-victorious indomitable impregnable invulnerable insurmountable
2. [ adjective ] incapable of being surmounted or excelled
Synonyms: insuperable
Examples:

"insuperable odds" "insuperable heroes"

Related terms: insurmountable
Similar spelling:   unconquered
  unquenchable
  unconcealed
  unconsolable
  unconvertible
  unconformable
  unconcentrated
  uncomparable
  unconsidered
  uncontrollable
  unconstrained
  unconscionable
  unconsecrated
  uncomparably