Definitions

immature

[im-uh-choor, -toor, -tyoor, -chur] / ˈɪm əˈtʃʊər, -ˈtʊər, -ˈtyʊər, -ˈtʃɜr /

ADJECTIVE

young, inexperienced

Synonyms

STRONGEST

childish premature

STRONG

green unfledged unripe

WEAK

adolescent baby babyish callow crude half-grown imperfect infantile infantine jejune juvenile kid kidstuff puerile raw sophomoric tender tenderfoot underdeveloped undergrown undeveloped unfinished unformed unseasonable unseasoned unsophisticated untimely wet behind ears youthful

Antonyms

STRONGEST

mature

WEAK

adult developed experienced grown old

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

The Army itself advises soldiers to “maintain the high ground,” and research shows that rapid-fire calls made under pressure by the morally immature lead to disaster.

From Slate • Apr. 13, 2026

“They are so delightfully immature that I felt like they were my cousins,” he says.

From Los Angeles Times • Apr. 7, 2026

The presence of one of our more talented humans, Ariana DeBose, is certainly a bonus, with Ms. DeBose playing the brilliant but oddly immature Lucy—Kay’s niece and Dorothy’s daughter.

From The Wall Street Journal • Mar. 10, 2026

It was the most mature of knocks after the most immature of winters.

From BBC • Feb. 24, 2026

I found the views and the behavior of the PAC immature.

From "Long Walk to Freedom" by Nelson Mandela

Vocabulary lists containing immature

List 5

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Brown Girl Dreaming

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Made You Look: Synonyms for "Immature"

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