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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.

Sticky buns feel immature once you have said korvapuusti.

From Salon • Mar. 8, 2026

The result is a man who is emotionally immature, dishonest and unable to take responsibility.

From MarketWatch • Mar. 3, 2026

Without MafB, macrophages remain in an immature state and are unable to properly protect the tissues where they reside.

From Science Daily • Mar. 1, 2026

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

From BBC • Feb. 24, 2026

Maybe Jasmine still thinks I’m immature, but she hasn’t said anything about it, now that she’s my girlfriend.

From "King and the Dragonflies" by Kacen Callender

From Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.