1. (adj) impregnable, inviolable, secure, strong, unassailable, unattackable
immune to attack; incapable of being tampered with
Synonyms: conceptive, potent, watertight, dependable, safe, absolute, substantial, inviolate, untroubled, inviolable, unshakable, untouchable, warm, good, stiff, inexpugnable, unafraid, infrangible, unattackable, unassailable, bulletproof, firm, solid, strong, sacrosanct, hard, impregnable, secure
Antonyms: vulnerable, conquerable, sterile, infertile, unfertile
2. (adj) conceptive, impregnable
capable of conceiving
Synonyms: impregnable, inviolable, conceptive, inexpugnable, strong, unattackable, unassailable, secure
Antonyms: infertile, conquerable, sterile, vulnerable, unfertile
3. (adj) impregnable, inexpugnable
incapable of being overcome, challenged or refuted
Synonyms: impregnable, inviolable, conceptive, inexpugnable, strong, unattackable, unassailable, secure
Antonyms: sterile, infertile, unfertile, vulnerable, conquerable
|
Synonyms for impregnable 
