undecided vs unresolved

undecided and unresolved both are adjectives.

Word	Noun	Adjective	Verb	Adverb
undecided	No	Yes	No	No
unresolved	No	Yes	No	No

As adjectives, undecided and unresolved are synonyms defined as:

undecided and unresolved: not brought to a conclusion; subject to further thought

Other synonyms of undecided include open, undetermined.

undecided (adjective)	unresolved (adjective)
characterized by indecision	not solved
not yet having made a commitment	characterized by musical dissonance; harmonically unresolved
not brought to a conclusion; subject to further thought	not brought to a conclusion; subject to further thought