im·​ma·​ture | \ ˌi-mə-ˈtu̇r How to pronounce immature (audio) , -ˈtyu̇r, -ˈchu̇r How to pronounce immature (audio) \

Definition of immature

1a : exhibiting less than an expected degree of maturity emotionally immature adults
b : lacking complete growth, differentiation, or development immature fruits a sexually immature bird
c : having the potential capacity to attain a definitive form or state : crude, unfinished a vigorous but immature school of art
2 archaic : premature

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Other Words from immature

immature noun
immaturely adverb
immaturity \ ˌi-​mə-​ˈtu̇r-​ə-​tē How to pronounce immaturity (audio) , -​ˈtyu̇r-​ , -​ˈchu̇r-​ \ noun

Synonyms & Antonyms for immature


adolescent, juvenile, young, youngish, youthful


adult, grown-up, mature, matured

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Examples of immature in a Sentence

The flock included both adult and immature birds. His teachers have complained about his immature behavior.

Recent Examples on the Web

The plots of the doomed mice, for instance, looked different right from the beginning, with a unique ratio of red blood cells to immature red blood cells. Quanta Magazine, "A New Way to Predict Infection’s Toll," 30 Aug. 2016 Austin Trzebiatowski, a freshman at MFHS, suffers from acute lymphoblastic leukemia (ALL), a cancer in which bone marrow creates too many immature white blood cells. Alec Johnson, Milwaukee Journal Sentinel, "Menomonee Falls High School, community rally around local teen fighting leukemia," 2 May 2018 Kavanaugh said) — Kavanaugh appeared to cast himself and Judge as more immature than nefarious or misogynistic. Alex Abad-santos, Vox, "Brett Kavanaugh’s questionable definition of “boof,” explained," 27 Sep. 2018 Screening out immature and abusive workers is a hard task for companies One contributor to the receipts problem is that businesses can’t weed out every bad apple during the hiring process. Nadra Nittle, Vox, "Racial slurs and fat-shaming insults keep popping up on receipts. Is Trump worsening the trend?," 29 Oct. 2018 But the coal industry argued in court that these technologies are too expensive and immature to deploy at scale, so the new standard is too difficult to meet. Umair Irfan, Vox, "The EPA plans to lift greenhouse gas limits on coal power plants," 6 Dec. 2018 While Wilhelm’s militarism and bellicosity aren’t defensible, any parallels to Donald Trump have to be limited to behavioral flaws: emotional, prone to anger, sometimes rash and perhaps even a little immature. WSJ, "Comparison Unfair to Wilhelm II and Trump," 11 Nov. 2018 Here's the deal: Children tend to have much finer hair than adults, and since hair dye and bleach can be damaging, a child's immature hair is much more susceptible to damage. Sam Escobar, Good Housekeeping, "How Young Is Too Young to Dye Your Kid's Hair?," 15 Oct. 2018 The secondary villains are the immature, misogynist tech bros who take advantage of Michael. Alex Abad-santos, Vox, "American Horror Story: Apocalypse was somehow both absolutely nuts and largely forgettable," 18 Nov. 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'immature.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of immature

1548, in the meaning defined at sense 2

History and Etymology for immature

Latin immaturus, from in- + maturus mature

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Statistics for immature

Last Updated

24 Jun 2019

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Time Traveler for immature

The first known use of immature was in 1548

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More Definitions for immature



English Language Learners Definition of immature

: not fully developed or grown
: acting in a childish way : having or showing a lack of emotional maturity


im·​ma·​ture | \ ˌi-mə-ˈtu̇r How to pronounce immature (audio) , -ˈtyu̇r, -ˈchu̇r\

Kids Definition of immature

1 : not yet fully grown or ripe an immature bird immature fruit
2 : acting in or exhibiting a childish manner an immature teenager immature behavior

Other Words from immature

immaturely adverb


im·​ma·​ture | \ ˌim-ə-ˈt(y)u̇(ə)r also -ˈchu̇(ə)r\

Medical Definition of immature

: lacking complete growth, differentiation, or development immature blood cells emotionally immature

Other Words from immature

immaturely adverb
immaturity \ -​ˈt(y)u̇r-​ət-​ē also -​ˈchu̇r-​ \ noun, plural immaturities

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More from Merriam-Webster on immature

Rhyming Dictionary: Words that rhyme with immature

Thesaurus: All synonyms and antonyms for immature

Spanish Central: Translation of immature

Nglish: Translation of immature for Spanish Speakers

Britannica English: Translation of immature for Arabic Speakers

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