unfalteringly vs unshakably

unfalteringly and unshakably both are adverbs.

Word	Noun	Adjective	Verb	Adverb
unfalteringly	No	No	No	Yes
unshakably	No	No	No	Yes

As adverbs, unfalteringly and unshakably are synonyms defined as:

unfalteringly and unshakably: with determination; in a determined manner

Other synonyms of unfalteringly include determinedly.

unfalteringly (adverb)	unshakably (adverb)
with determination; in a determined manner	with determination; in a determined manner