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[im-uh-choo r, -too r, -tyoo r, -chur] /ˈɪm əˈtʃʊər, -ˈtʊər, -ˈtyʊər, -ˈtʃɜr/
not mature, ripe, developed, perfected, etc.
emotionally undeveloped; juvenile; childish.
Physical Geography. youthful (def 5).
Archaic. premature.
Origin of immature
First recorded in 1540-50, immature is from the Latin word immātūrus unripe, hence, untimely. See im-2, mature
Related forms
immaturely, adverb
immatureness, noun
2. callow, puerile, babyish. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for immaturely
Historical Examples
  • It was not easy to conceive of her as being the mother of a son so immaturely mature.

    The Black Bag Louis Joseph Vance
  • immaturely loveth the youth, and immaturely also hateth he man and earth.

    Thus Spake Zarathustra Friedrich Nietzsche
  • immaturely and unconsciously sexual, she looked with more hope of satisfaction at male faces than at female.

    What Not Rose Macaulay
  • He rose to be a young man of great promise, as to abilities; and died too immaturely for his fame.

    The English Spy Bernard Blackmantle
  • We should use these advantages well, and to do so we should not immaturely pursue greater ones.

  • Would he now immaturely fall a victim to an enticing face and the cares of a household?

    Robert Orange John Oliver Hobbes
British Dictionary definitions for immaturely


/ˌɪməˈtjʊə; -ˈtʃʊə/
not fully grown or developed
deficient in maturity; lacking wisdom, insight, emotional stability, etc
(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
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for immaturely



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')
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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