immaturely vs immature

immaturely is not an adjective while immature is an adjective.

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

immaturely (adjective)	immature (adjective)
	not yet mature
	characteristic of a lack of maturity
	(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

immaturely (adverb)	immature (adverb)
in an immature manner