inexpugnable
I
adjective
defensible, formidable, hardy, immune, impenetrable, imperdible, impregnable, indomitable, inexpugnabilis, inextinguishable, insuperable, insurmountable, invincible, inviolable, invulnerable, irresistible, mighty, potent, powerful, protected, puissant, redoubtable, resistless, safe, secure, secure from capture, strong, sturdy, tenable, unassailable, unattackable, unbeatable, unbreakable, unchallengeable, unconquerable, unsubduable, unyielding
II
index
immune, insurmountable, invincible
Burton's Legal Thesaurus.
William C. Burton.
2006