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impregnable

English

  1. 🔊 incapable of being overcome, challenged or refuted
    “an impregnable argument”
  2. 🔊 immune to attack
    “an impregnable fortress”
  3. 🔊 capable of conceiving

Similar words

inexpugnable conceptive inviolable secure strong unassailable unattackable deathless defended guarded immortal impenetrable imperishable incontestable incorruptible indelible indestructible indomitable ineffaceable ineradicable inexpugnable inextinguishable insuperable invincible