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immature

[im-uh-choo r, -too r, -tyoo r, -chur] /ˈɪm əˈtʃʊər, -ˈtʊər, -ˈtyʊər, -ˈtʃɜr/
adjective
1.
not mature, ripe, developed, perfected, etc.
2.
emotionally undeveloped; juvenile; childish.
3.
Physical Geography, youthful (def 5).
4.
Archaic. premature.
Origin
1540-1550
1540-50; < Latin immātūrus unripe, hence, untimely. See im-2, mature
Related forms
immaturely, adverb
immatureness, noun
Synonyms
2. callow, puerile, babyish.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for immaturely

immature

/ˌɪməˈtjʊə; -ˈtʃʊə/
adjective
1.
not fully grown or developed
2.
deficient in maturity; lacking wisdom, insight, emotional stability, etc
3.
(geography) a less common term for youthful (sense 4)
Derived Forms
immaturity, immatureness, noun
immaturely, adverb
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for immaturely

immature

adj.

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.

Online Etymology Dictionary, © 2010 Douglas Harper
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immaturely in Medicine

immature im·ma·ture (ĭm'ə-tyur', -tur', -chur')
adj.
Not fully grown or developed.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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