Synonyms for infantile

Adjective

1. childish, infantile, immature (vs. mature)

usage: indicating a lack of maturity; "childish tantrums"; "infantile behavior"

2. infantile

usage: of or relating to infants or infancy; "infantile paralysis"

3. infantile, young (vs. old), immature

usage: being or befitting or characteristic of an infant; "infantile games"