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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.

Synonyms:

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.

Usage examples: