Immature

//ɪməˈtjʊə(ɹ)// adj, noun

adj, noun ·Common ·High school level

Definitions

Noun
  1. 1
    An immature member of a species.

    "There are many genera and even families of Brachypylina for which immatures are not yet known, and thus numerous examples of adult convergence and misclassification remain to be revealed: such is the case with Hypozetes."

Adjective
  1. 1
    Occurring before the proper time; untimely, premature (especially of death). archaic

    "And thou also canst best account for the causes of her immature death […]."

  2. 2
    Not fully formed or developed; not grown.
  3. 3
    Childish in behavior; juvenile.

    "You're only young once, but you can be immature the rest of your life."

Adjective
  1. 1
    (of birds) not yet having developed feathers wordnet
  2. 2
    not yet mature wordnet
  3. 3
    characteristic of a lack of maturity wordnet
  4. 4
    not fully developed or mature; not ripe wordnet
  5. 5
    (used of living things especially persons) in an early period of life or development or growth wordnet

Synonyms

All synonyms
adolescentbabyishchildishgreenjejuneunderdeveloped

Example

More examples

"He was so immature, he couldn't resist the temptation."

Etymology

From Middle French immature. Partially displaced unripe, from Old English unrīpe (“unripe, immature”).

Related phrases

immature dependent

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.