Antonyms of noun adult

1 of 2 senses of adult

Sense 1
adult, grownup -- (a fully developed person from maturity onward)
       Antonym of juvenile (Sense 1)
      => juvenile, juvenile person -- (a young person, not fully developed)

Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun adult

2 senses of adult

Sense 1
adult, grownup -- (a fully developed person from maturity onward)
       => person, individual, someone, somebody, mortal, soul -- (a human being; "there was too much for one person to do")

Sense 2
adult -- (any mature animal)
       => animal, animate being, beast, brute, creature, fauna -- (a living organism characterized by voluntary movement)

Antonyms of adj adult

2 senses of adult

Sense 1
adult, big, full-grown, fully grown, grown, grownup -- ((of animals) fully developed; "an adult animal"; "a grown woman")

INDIRECT (VIA mature) -> immature -- (not yet mature)

Sense 2
pornographic, adult -- (designed to arouse lust; "pornographic films and magazines"; "adult movies")

INDIRECT (VIA sexy) -> unsexy -- (not sexually aroused or arousing)

Similarity of adj adult

2 senses of adult

Sense 1
adult, big, full-grown, fully grown, grown, grownup -- ((of animals) fully developed; "an adult animal"; "a grown woman")
       => mature (vs. immature) -- (having reached full natural growth or development; "a mature cell")

Sense 2
pornographic, adult -- (designed to arouse lust; "pornographic films and magazines"; "adult movies")
       => sexy (vs. unsexy) -- (marked by or tending to arouse sexual desire or interest; "feeling sexy"; "sexy clothes"; "sexy poses"; "a sexy book"; "sexy jokes")