immature

[im-uh-choor, -toor, -tyoor, -chur]
adjective
1.
not mature, ripe, developed, perfected, etc.
2.
emotionally undeveloped; juvenile; childish.
3.
Physical Geography, youthful ( def 5 ).
4.
Archaic. premature.

Origin:
1540–50; < Latin immātūrus unripe, hence, untimely. See im-2, mature

immaturely, adverb
immatureness, noun


2. callow, puerile, babyish.
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World English Dictionary
immature (ˌɪməˈtjʊə, -ˈtʃʊə)
 
adj
1.  not fully grown or developed
2.  deficient in maturity; lacking wisdom, insight, emotional stability, etc
3.  geography a less common term for youthful
 
imma'turity
 
n
 
imma'tureness
 
n
 
imma'turely
 
adv

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

immature
1548, "untimely, premature," from L. immaturus "untimely, unripe," from in- "not" + maturus (see mature). In 16c., usually in ref. to death; modern sense of "not fully developed" first recorded 1641.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

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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Example sentences
We must run some risks, as all immature creatures do, in the effort to use our
  own limbs.
Even during the spawning season, its reproductive system remains immature.
The green, horizontal blossom below is still too immature to benefit from
  insect visitors.
Immature bed bugs have a similar appearance to adults, with the smallest being
  the size of the head of a pin.
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