im·​ma·​ture | \ˌi-mə-ˈtu̇r, -ˈtyu̇r, -ˈchu̇r \

Definition of immature 

1 archaic : premature

2a : lacking complete growth, differentiation, or development immature fruits a sexually immature bird

b : having the potential capacity to attain a definitive form or state : crude, unfinished a vigorous but immature school of art

c : exhibiting less than an expected degree of maturity emotionally immature adults

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Other Words from immature

immature noun
immaturely adverb
immaturity \ ˌi-​mə-​ˈtu̇r-​ə-​tē , -​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

Don’t let rustic conditions fool you into thinking the coffee industry itself is immature. Lauren Mowery, USA TODAY, "Costa Rican coffee, from rural farms to Starbucks' visitor center," 26 June 2018 Antonio Cassano Antonio Cassano is one of the most petulant, immature players in football., "6 Players That Never Grew Up," 24 June 2018 The industry is also immature, with new vendors popping up and dropping out. Adrianne Jeffries, New York Times, "Governments Explore Using Blockchains to Improve Service," 27 June 2018 What channels—analytics or otherwise—are still untapped or immature? Rob Mahoney,, "Breakaway: Inside the Life of Future Lottery Pick Mikal Bridges," 15 June 2018 Investments in companies with immature technologies may accelerate the growth and maturation of their technologies, but are unlikely to produce products. Fred D. Ledley, STAT, "30 years is too long to wait for new medicines. There are ways to speed up drug development," 6 June 2018 Sets are immature bulbs grown the previous year and offer the most limited cultivar choices. The Editors Of Organic Life, Good Housekeeping, "How To Grow Onions," 1 Feb. 2018 But his actions towards his staff, as reported by the Times, are shocking and unconscionable, not to mention immature and unbecoming of a U.S. congressman. Will Bunch,, "Time's up, Rep. Pat Meehan. Without ethics, you are nothing | Will Bunch," 22 Jan. 2018 In this case, the scientists from the Rigshospitalet fertility center in Copenhagen were able to create an artificial ovary that could be used to grow immature egg cells into a form that could then later be transplanted back into the woman. Sy Mukherjee, Fortune, "Scientists Say They've Made Progress on an Artificial Ovary to Help Cancer Patients. There's a Catch," 2 July 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 1

History and Etymology for immature

Latin immaturus, from in- + maturus mature

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Statistics for immature

Last Updated

28 Oct 2018

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Time Traveler for immature

The first known use of immature was in 1548

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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, -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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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).


full of whispering sounds

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