unprepossessing vs unpresentable

unprepossessing and unpresentable both are adjectives.

Word	Noun	Adjective	Verb	Adverb
unprepossessing	No	Yes	No	No
unpresentable	No	Yes	No	No

As adjectives, unprepossessing and unpresentable are synonyms defined as:

unprepossessing and unpresentable: creating an unfavorable or neutral first impression

unprepossessing (adjective)	unpresentable (adjective)
creating an unfavorable or neutral first impression	creating an unfavorable or neutral first impression