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

juvenile books.

young; youthful

juvenile years.

immature; childish; infantile

His juvenile tantrums are not in keeping with his age.

a young person; youth.

Theater .

a youthful male or female role.

an actor or actress who plays such parts.

a book for children.

Ornithology . a young bird in the stage when it has fledged, if altricial, or has replaced down of hatching, if precocial.

a two-year-old racehorse.

adjective

adult , grown-up , mature

noun

adult

adjective

adolescent , babyish , beardless , blooming , boyish , budding , callow , childlike , developing , formative , fresh , girlish , green , growing , immature , inexperienced , infant , infantile , jejune , junior , kid stuff * , milk-fed , naive , pubescent , puerile , teenage , tender , undeveloped , unfledged , unripe , unsophisticated , unweaned , vernal , young , younger , youthful , ephebic

noun

adolescent , boy , child , girl , infant , kid * , minor , youngster , youth , bud , innocent , moppet , tot , callow , childish , green , growing , immature , juniority , juvenility , pubescent , puerile , puisne , teen , tender , undeveloped , unripe , young , youthful