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



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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 small-mesh trawl fishery that operated in the New York Bight, and killed many immature whiting, probably drove down inshore numbers, although the fish remained abundant offshore. Capt. John Mcmurray, Field & Stream, "10 Great East Coast Fisheries That No Longer Exist," 10 Feb. 2020 And when ovarian tissue was dried for more than ten minutes, only a fraction of the follicles, which contain immature eggs, survived. Katherine J. Wu, Smithsonian, "Scientists Pumped Ovarian Tissue Full of Sugar and Microwaved It. Here’s Why," 10 Dec. 2019 Offshore wind was capital-intensive and immature, the logic went, so needed help. The Economist, "Lessons from Britain, the world’s biggest offshore wind market," 21 Sep. 2019 Nathan's body produces immature red blood cells, which break apart rapidly. Karina Bland, azcentral, "5-year-old Nathan is why we should allow more people to donate blood," 25 Aug. 2019 Chronic lymphocytic leukemia, or CLL, is typically a slow-growing cancer in which immature white blood cells multiply in the bone marrow and spread throughout the body. Michael Nedelman, CNN, "Chemo-free drug combo shows 'dramatic' improvement against common leukemia in adults," 31 July 2019 The Vanderpump Rules cast is known for being a bit immature, and well, kind of ratchet. Olivia Harrison,, "Here’s Where All The Vanderpump Rules Cast Members Live," 8 Jan. 2020 Taking care of yourself is not immature or selfish. NBC News, "Diva or self-care icon? Adam Driver walkout prompts debate," 18 Dec. 2019 Wilms tumor, a solid cancerous growth of the kidney that arises from immature kidney cells, most often affects children who are 3 to 4 years old. San Antonio Express-News, "Becoming Bryce Strong," 31 Oct. 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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Time Traveler for immature

Time Traveler

The first known use of immature was in 1548

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Statistics for immature

Last Updated

18 Feb 2020

Cite this Entry

“Immature.” Dictionary, Merriam-Webster, Accessed 21 Feb. 2020.

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More Definitions for immature


How to pronounce immature (audio) How to pronounce immature (audio)

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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