unswerving vs undeviating

unswerving and undeviating both are adjectives.

Word	Noun	Adjective	Verb	Adverb
unswerving	No	Yes	No	No
undeviating	No	Yes	No	No

As adjectives, unswerving and undeviating are synonyms defined as:

unswerving and undeviating: going directly ahead from one point to another without veering or turning aside

unswerving (adjective)	undeviating (adjective)
firm and dependable especially in loyalty	going directly ahead from one point to another without veering or turning aside
going directly ahead from one point to another without veering or turning aside	used of values and principles; not subject to change; steady