invincible, impregnable and incontestable.
Other words for "impregnable" (synonyms) are: potent, inviolate, unshakable, untouchable, unafraid, strong, secure, conceptive
Impregnable has many synonyms. Some examples are invincible, unassailable, inviolable, secure, unattackable and strong. Inexpugnable is a synonym for impregnable, but it just doesn't sound like a word that anyone would ever use.
India took unassailable lead when it won the second match of the three match series. Here unassailable is the word used in the sentence.
no one could ever believe the dentist was arrested because his reputation was unassailable
Brenda's claim that she was exempt from taxation because she had earned no money was unassailable.
Unassailable means unable to be attacked, questioned, or defeated. It suggests that something is secure or invulnerable.
Adjective: Not open to attack or assault, as by military force, brute strength, or logical argument; not subject to denial or dispute. Example: Shakespeare's genius gives his works an unassailable position in world literature. "No one is more dangerous than he who imagines himself pure in heart: for his purity, by definition, is unassailable." -- James Baldwin
Unassailable, invulnerable, plenipotent, circumspect, dependable.
Armed, Armored, Projectile Proof... 8D, Tankified, body Guard, if these don't work, go to "Dictionary.Reference.com" 8D
salable, saleable inhalable, unsalable, unsaleable unassailable, unavailable
invulnerable, indestructible, unconquerable, unbeatable, indomitable, unassailable; impregnable, inviolable; informal bulletproof.
They are synonyms.