English Reference
adjective · noun

juvenile

adj. · n.
US /ˈdʒuvəˌnaɪɫ/ UK /dʒˈuːvənˌaɪl/ ju·ve·nile UK spelling juvenile's, juvenile's

  1. 01 B2 Upper Intermediate

    adj.relating to young people or animals that are still growing.

    adj.relating to or characteristic of young people or animals that have not yet reached physiological or legal maturity.

    Simple

    The scientist studied the juvenile birds as they learned to fly.

    In context

    The research team monitored the juvenile population of sea turtles to determine if the nesting grounds were successfully supporting the next generation.

  2. 02 B2 Upper Intermediate

    adj.acting in a silly way that is more typical of a child than an adult.

    adj.displaying a lack of maturity or seriousness; often used pejoratively to describe adult behaviour.

    Simple

    He made a juvenile joke that nobody in the office found funny.

    In context

    The critic dismissed the film's humour as juvenile, arguing that the script relied too heavily on cheap physical gags rather than clever dialogue.

  3. 03 C1 Advanced FormalTechnical Law

    n.a young person who is not yet an adult in the eyes of the law.

    n.an individual who has not yet reached the age of majority; frequently used in legal contexts regarding criminal responsibility.

    Simple

    The court decided to treat the suspect as a juvenile because of his age.

    In context

    Legislators are currently debating whether certain violent crimes should allow a juvenile to be tried in an adult court system.

  4. 04 C1 Advanced Technical Science

    n.an animal that is not yet fully grown or able to breed.

    n.a young animal that has not yet reached sexual maturity or its adult plumage/coat.

    Simple

    The juveniles of this species look very different from the adults.

    In context

    Identifying the species can be difficult because the juveniles often lack the distinctive markings found on mature specimens.

    offspringyoungling

The team, for the first time, combined established salmon spawning surveys, river temperature models and analysis of salmon otoliths, or ear bones, to track the factors affecting juvenile salmon developing inside their eggs.

Phys.org· 21 Aug 2026

Kilkeel Angling Club said "several generations of juvenile fish have been wiped out".

BBC News· 12 Aug 2026

Borrowed from Latin iuvenīlis (“youthful; juvenile”), from iuvenis (“young; a youth”) + -īlis (suffix forming adjectives indicating a relationship or a pertaining to). Iuvenis is ultimately derived from Proto-Indo-European h₂yuh₁en- (“young”), from h₂óyu (“long life; lifetime”) (from h₂ey- (“age; life”)) + h₁én (“in”).

Etymology adapted from Wiktionary, available under CC BY-SA 4.0.

This entry
Origin ine-pro *h₂yuh₁en-
Level C1 · Advanced
Frequency Frequent
Updated