steadfast vs unshakable

steadfast and unshakable both are adjectives.

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

As adjectives, steadfast and unshakable are synonyms defined as:

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

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

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