immature

[im-uh-choor, -toor, -tyoor, -chur]

adjective

1. not mature, ripe, developed, perfected, etc.

2. emotionally undeveloped; juvenile; childish.

   Synonyms: babyish, puerile, callow

3. Physical Geography.,  youthful.

4. Archaic.,  premature.

immature

/ -ˈtʃʊə, ˌɪməˈtjʊə /

adjective

1. not fully grown or developed

2. deficient in maturity; lacking wisdom, insight, emotional stability, etc

3. geography a less common term for youthful

Other Word Forms

• immaturely adverb
• immatureness noun
• immaturity noun

Word History and Origins

Origin of immature¹

First recorded in 1540–50, immature is from the Latin word immātūrus unripe, hence, untimely. See im- ², mature

Example Sentences

Andrew Langdon KC, defending, told the court Gunter was "immature for his age", had a "very low IQ" and had "recognised emotional and learning difficulties".

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"I think Bryson was a little immature back then, four years ago, but I think he is a much more mature player and more mature person now," Miceli told BBC Sport.

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At first he doesn’t accept her apology but, being the immature oaf that he is, Chris gets back at her by using her as human torpedo to destroy their gooey, disgusting alien target.

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It was the act of an “immature, emotionally disturbed and mentally ill youth” who had killed in a trancelike state, said defense attorney Emil Berman.

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Like all young players thrust into the limelight, White admitted Hampton was a "little immature" when they first played together at Birmingham.

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Related Words

• childish 
• premature