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

Massage therapist and part-time singer Phoebe (Lisa Kudrow) is quirky and struggling actor Joey (Matt LeBlanc) is emotionally immature. Whitney Friedlander, CNN, "The 25 most relatable 'Friends' episodes as the show turns 25," 16 Aug. 2019 Although some on the island have long viewed the 40-year-old governor as immature and little more than an extension of his father — a former governor — Rossello managed to avoid widespread criticism until a few weeks ago. Los Angeles Times, "Puerto Rico Gov. Ricardo Rossello clings to power amid rumors he’ll step down," 24 July 2019 Do these establish how immature and brash Kabir is early on? Ananya Bhattacharya, Quartz India, "Dear woke India, where were you before Kabir Singh?," 28 June 2019 In court filings, Edelstein called Judge Stephens immature and vindictive. Keith Bierygolick,, "‘I thought about killing myself’: Magistrate fired by judge claims religious discrimination," 13 June 2019 What more, younger children who are just immature are being diagnosed for reasons that have nothing to do with their actual medical need. Julia Belluz, Vox, "Kids who start kindergarten young are more likely to be diagnosed with ADHD," 17 Dec. 2018 Sea ice allows immature walruses to rest as their mothers dive over the shallow continental shelf to eat clams and snails. Dan Joling, Anchorage Daily News, "Thousands of walruses show up early on Northwest Alaska coast as sea ice recedes," 1 Aug. 2019 Still, what sort of immature adult collects old comics? Peter Rowe, San Diego Union-Tribune, "Faster than a speeding $1,000 bill: Comic-Con’s frenzied market in used comics," 20 July 2019 At the time, comics fandom was primarily about buying and reading comics and fanzines, and fans were frequently looked down on as immature by mainstream culture. Los Angeles Times, "Comic-Con is not just about comic books anymore. That feels like a loss — and a win," 18 July 2019

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

19 Aug 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

Comments on immature

What made you want to look up immature? Please tell us where you read or heard it (including the quote, if possible).


a haphazard or makeshift solution

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