undescriptive vs descriptive

undescriptive and descriptive both are adjectives.

Word	Noun	Adjective	Verb	Adverb
undescriptive	No	Yes	No	No
descriptive	No	Yes	No	No

undescriptive (adjective)	descriptive (adjective)
not successful in describing	of or relating to an approach to linguistic analysis that aims at the description of a language's forms, structures and usage
	serving to describe or inform or characterized by description