undetermined vs unexplained

undetermined and unexplained both are adjectives.

Word	Noun	Adjective	Verb	Adverb
undetermined	No	Yes	No	No
unexplained	No	Yes	No	No

undetermined (adjective)	unexplained (adjective)
not yet having been ascertained or determined	having the reason or cause not made clear
not precisely determined or established; not fixed or known in advance	not explained
not brought to a conclusion; subject to further thought