impregnable

Adjective
  1. Immune to attack;
    Incapable of being tampered with (synset 302536283)
    "an impregnable fortress"; "fortifications that made the frontier inviolable"; "a secure telephone connection"
    similar to: invulnerable - immune to attack; impregnable
    same as: inviolable, secure, strong, unassailable, unattackable
  2. Capable of conceiving (synset 301005346)
    similar to: fertile - capable of reproducing
    same as: conceptive
  3. Incapable of being overcome, challenged or refuted (synset 300572182)
    "an impregnable argument"; "impregnable self-confidence"
    similar to: unconquerable - not capable of being conquered or vanquished or overcome
    same as: inexpugnable

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