undeviating vs unswerving

undeviating and unswerving both are adjectives.

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

As adjectives, undeviating and unswerving are synonyms defined as:

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

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