Borrowed from Latin iuvenīlis, from iuvenis ("young; a youth") + -īlis ("suffix forming adjectives indicating a relationship or a pertaining to").

• (RP) IPA: /ˈd͡ʒuːvənaɪl/
• (America) IPA: /ˈd͡ʒuːvənaɪl/, /ˈd͡ʒuːvənəl/

juvenile

1. Young; not fully developed.
2. Characteristic of youth or immaturity; childish.

   Synonyms: infantile, juvey, puerile, Thesaurus:childish

• adult
• mature
• nonjuvenile
• old
• senile

• French: juvénile
• German: jugendlich
• Russian: малоле́тний

• French: juvénile
• German: jung, unreif, kindisch

juvenile (plural juveniles)

1. A prepubescent child.
2. A person younger than the age of majority; a minor.

   Synonyms: infant, juvie

3. (criminal law) A person younger than the age of full criminal responsibility, such that the person either cannot be held criminally liable or is subject to less severe forms of punishment.
4. (literature) A publication for young adult readers.
5. (theater) An actor playing a child's role.
6. (zoology) A sexually immature animal.
7. A two-year-old racehorse.
   • 1972, Edward Samuel Montgomery, The Thoroughbred, page 449:

     Even more incredible is the legion of two-year-olds who win handsomely as juveniles and then disappear from the racetrack.

   • 2005, Ken McLean, Designing Speed in the Racehorse, page 206:

     Professional trainers foster young horses with obvious potential. Instance the way Sir Michael Stoute uses patience to bring along his two-year-old colts and fillies at Newmarket, or the careful approach taken with juveniles by that wonderful conditioner Charlie Whittingham in California.

   • 2012, Encyclopedia of British Horse Racing, page 6:

     Thereafter, males aged two to four are colts, females are fillies, racing two-year-olds are sometimes referred to as juveniles, and animals still running at five, the age of thoroughbred maturity, or older, are horses or mares according to gender.

• French: adolescent