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

"We don't know all the threats of these immature methods yet, but it's a bit hard to just take them off the table because they're uncomfortable to think about," she said.

Read more on Science Daily

It feels immature on the part of the directors—or the creators of the series, brothers Harry and Jack Williams.

Read more on The Wall Street Journal

Overall survival data were immature but showed a positive trend, with no unexpected safety findings observed, Roche said.

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“This man is very inexperienced, even immature,” Khrushchev told aides after the meeting.

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So, having briefly lived some version of the 1950s teen dream—drive-in movies, car hops—I reverted to being an immature 14-year-old in the brain class.

Read more on The Wall Street Journal

Related Words

• childish 
• premature