unretentive vs forgetful

unretentive and forgetful both are adjectives.

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

As adjectives, unretentive and forgetful are synonyms defined as:

unretentive and forgetful: (of memory) deficient in retentiveness or range

Other synonyms of unretentive include short.

unretentive (adjective)	forgetful (adjective)
(of memory) deficient in retentiveness or range	(of memory) deficient in retentiveness or range
	not mindful or attentive
	failing to keep in mind