immature vs unripe

immature and unripe both are adjectives.

Word	Noun	Adjective	Verb	Adverb
immature	No	Yes	No	No
unripe	No	Yes	No	No

As adjectives, immature and unripe are synonyms defined as:

Other synonyms of immature include green, unripened.

immature (adjective)	unripe (adjective)
not yet mature	not fully developed or mature; not ripe
characteristic of a lack of maturity	not fully prepared
(used of living things especially persons) in an early period of life or development or growth
(of birds) not yet having developed feathers
not fully developed or mature; not ripe