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

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 Parents occasionally have to suck it up and love their children through their immature and disrespectful displays. Amy Dickinson,, "Dad might skip graduation because of feud with daughter," 8 May 2018 Jean-Pierre Léaud captures the impulsiveness of the immature younger leading man, and Jean-Pierre Aumont is poignant at the older leading man. Hal Boedeker,, "Enzian screens peerless 'Day for Night'," 13 July 2018 Colony collapse disorder is the phenomenon that occurs when the majority of worker bees in a hive abandon the queen and the immature bees. Bethany Ao,, "Philly millennials are buzzing about beekeeping," 11 July 2018 Although his dullish voice-overs attempt to establish him as a deep thinker and observer, Moss outwardly comes off as anything but: surly, cocky, needy, slackerish, immature. Gary Goldstein,, "Review: Southern drama 'Moss' underwhelms, but it has great views," 5 July 2018 Pors then seeded this scaffold with immature human or mouse follicles and grafted the complex into female mice. Katherine J. Wu, Smithsonian, "How Artificial Ovaries Could Expand Fertility Options For Chemo Patients," 5 July 2018 The state was the first to legalize the recreational use of the substance by an act of a state legislature, and the law allows adults to possess up to 1 ounce of marijuana, two mature and four immature plants. CBS News, "Recreational marijuana now legal in Vermont as new law takes effect," 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

16 Sep 2018

Look-up Popularity

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).


occurring twice a year or every two years

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