unshakable vs steadfast

unshakable and steadfast both are adjectives.

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

As adjectives, unshakable and steadfast are synonyms defined as:

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

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

unshakable (adjective)	steadfast (adjective)
without flaws or loopholes	firm and dependable especially in loyalty
marked by firm determination or resolution; not shakable	marked by firm determination or resolution; not shakable