He rose to be a young man of great promise, as to abilities; and died too immaturely for his fame.
immaturely loveth the youth, and immaturely also hateth he man and earth.
immaturely and unconsciously sexual, she looked with more hope of satisfaction at male faces than at female.
Would he now immaturely fall a victim to an enticing face and the cares of a household?
We should use these advantages well, and to do so we should not immaturely pursue greater ones.
It was not easy to conceive of her as being the mother of a son so immaturely mature.
1540s, "untimely, premature," from Latin immaturus "untimely, unripe," from assimilated form of in- "not, opposite of" (see in- (1)) + maturus (see mature (v.)). In 16c., usually in reference to early death; modern sense of "not fully developed" first recorded 1640s. In reference to mentalities or behaviors not considered age-appropriate, from 1920.
immature im·ma·ture (ĭm'ə-tyur', -tur', -chur')
Not fully grown or developed.