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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
1540-50; < Latin 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. 2015.
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Examples from the Web for immature
Contemporary Examples
Historical Examples
  • The most immature essay must be more than a summary; a mere summary is never an essay.

  • And none but calves the most immature can possibly sympathize with him.

  • A man is bound above all things to protect those who depend on him from his own immature or revocable impulses.

    Robert Elsmere Mrs. Humphry Ward
  • That is abortive that is untimely, that has not been borne its full time, that is immature.

    The Verbalist Thomas Embly Osmun, (AKA Alfred Ayres)
  • The Oriental mind is an old, old mind, richly stored with experience and memories,—not in the least gullible and immature.

    Peking Dust Ellen N. La Motte
British Dictionary definitions for immature


/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 immature

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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immature 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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