unmindful vs unretentive

unmindful and unretentive both are adjectives.

Word	Noun	Adjective	Verb	Adverb
unmindful	No	Yes	No	No
unretentive	No	Yes	No	No

unmindful (adjective)	unretentive (adjective)
not mindful or attentive	(of memory) deficient in retentiveness or range
(followed by `to' or `of') lacking conscious awareness of