juvenile

American  

[joo-vuh-nl, -nahyl] / ˈdʒu və nl, -ˌnaɪl /

adjective

1. of, pertaining to, characteristic of, or suitable or intended for young persons.

   juvenile books.

2. young; youthful.

   juvenile years.

3. immature; childish; infantile.

   His juvenile tantrums are not in keeping with his age.

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noun

1. a young person; youth.

2. Theater.

   1. a youthful male or female role.

   2. an actor or actress who plays such parts.

3. a book for children.

4. Ornithology. a young bird that has its first set of contur feathers.

5. a two-year-old racehorse.

juvenile British  

/ ˈdʒuːvɪˌnaɪl /

adjective

1. young, youthful, or immature

2. suitable or designed for young people

   juvenile pastimes

3. (of animals or plants) not yet fully mature

4. of or denoting young birds that have developed their first plumage of adult feathers

5. geology occurring at the earth's surface for the first time; new

   juvenile water

   juvenile gases

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noun

1. a juvenile person, animal, or plant

2. an actor who performs youthful roles

3. a book intended for young readers

Usage

What does juvenile mean? Juvenile describes something that is related to youth or young people. Generally, juvenile is used to describe something that has to do with children, as in Sam folded the juvenile clothing before he folded the baby clothing. Juvenile can also describe something that is related to youth or being young, as in Now in her 80s, Hannah looked back fondly on her juvenile years. Juvenile can also be used to describe something that is related to youth in a negative way, such as being immature or naive, as in Drawing on the walls is juvenile behavior that most parents won’t tolerate. As a noun, juvenile is a young person, as in The lost driver got directions from the friendly juvenile on the corner. Jejune is a synonym for juvenile in the sense of something childish or immature. But jejune can also describe something that is bland or uninspiring, as in He wrote a jejune story about making eggs for breakfast. Example: The author wrote juvenile fiction that was incredibly popular with the country’s children.

Synonym Usage

See young.

Other Word Forms

Derived Forms

• prejuvenile
  adjective
• unjuvenile
  adjective
• juvenileness
  noun
• juvenilely
  adverb

Etymology

Origin of juvenile

First recorded in 1615–25; from Latin juvenīlis “youthful,” equivalent to juven(is) “youthful” + -īlis adjective suffix; see -ile

Explanation

If you're being juvenile, you're not acting your age. Unless of course you are a juvenile. In which case, carry on. While the noun juvenile refers to someone not physically or emotionally mature, the word is often used as an adjective to refer to anything specifically for young people, such as juvenile reading materials or movies. It can be derisive, as in "Don't act so juvenile," suggesting a silliness unbecoming an adult. The word comes from the Latin juvenīlis, meaning "youthful" — similar, but much more flattering.

Example Sentences

County’s juvenile halls are housed in what’s commonly referred to as a “step down” setting before they are released to the public.

From Los Angeles Times • May 28, 2026

The training involved participation and coaching by people who were incarcerated at Graterford prison, in Pennsylvania—many of them juvenile lifers.

From Slate • May 27, 2026

Scientists say the Riodeva fossil site continues to yield valuable material, including additional bones from the same adult dinosaur and rare juvenile remains.

From Science Daily • May 17, 2026

She hopes to bolster collaboration between the criminal and juvenile dependency systems, writing, “I have seen how families often navigate these systems simultaneously, yet the systems rarely communicate with one another.”

From Los Angeles Times • May 1, 2026

Senator Simpson knew firsthand that you cannot judge a person's full potential by his juvenile misconduct.

From "Just Mercy" by Bryan Stevenson

Related Words

• adolescent
• boy
• girl
• infant
• minor
• youngster
• youth