inviolable vs unassailable

inviolable and unassailable both are adjectives.

Word	Noun	Adjective	Verb	Adverb
inviolable	No	Yes	No	No
unassailable	No	Yes	No	No

As adjectives, inviolable and unassailable are synonyms defined as:

inviolable and unassailable: immune to attack; incapable of being tampered with

Other synonyms of inviolable include impregnable, secure, strong, unattackable.

inviolable (adjective)	unassailable (adjective)
incapable of being transgressed or dishonored	without flaws or loopholes
not capable of being violated or infringed	impossible to assail
immune to attack; incapable of being tampered with	immune to attack; incapable of being tampered with
must be kept sacred