Foolish, adolescent, babyish, and fatuous are all synonyms for childish. Mature and sophisticated are these antonyms of childish. And here are another 26 synonyms for childish.
Childish Synonyms
1. childlike
- Adolescent
- Boyish
- Child's
- Childlike
- Children's
- Girlish
- Teenage
- Teenaged
- Young-looking
- Young
- Youthful
- Bread-and-butter
2. immature
- Babyish
- Fatuous
- Foolish
- Immature
- Inane
- Infantile
- Irresponsible
- Jejune
- Juvenile
- Puerile
- Silly
- Stupid
- Naive