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Definition of impregnable:

  1. Capable of being impregnated, as the egg of an animal, or the ovule of a plant.
  2. Not to be stormed, or taken by assault; incapable of being subdued; able to resist attack; unconquerable; as, an impregnable fortress; impregnable virtue.


safe, strong, inviolate, conceptive, warm, absolute, solid, invulnerable, unassailable, stiff, inviolable, unconquerable, unshakable, substantial, watertight, good, unafraid, untouchable, win, unattackable, bulletproof, sacrosanct, dependable, untroubled, secure, indomitable, infrangible, firm, invincible, do, potent, inexpugnable, hard.

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