unshakable vs unfaltering

unshakable and unfaltering both are adjectives.

Word	Noun	Adjective	Verb	Adverb
unshakable	No	Yes	No	No
unfaltering	No	Yes	No	No

As adjectives, unshakable and unfaltering are synonyms defined as:

unshakable and unfaltering: marked by firm determination or resolution; not shakable

Other synonyms of unshakable include firm, steadfast, steady, stiff, unbendable, unwavering.

unshakable (adjective)	unfaltering (adjective)
without flaws or loopholes	marked by firm determination or resolution; not shakable
marked by firm determination or resolution; not shakable