ununderstood vs understood

ununderstood and understood both are adjectives.

Word	Noun	Adjective	Verb	Adverb
ununderstood	No	Yes	No	No
understood	No	Yes	No	No

ununderstood (adjective)	understood (adjective)
not understood	fully apprehended as to purport or meaning or explanation
	implied by or inferred from actions or statements