childish
(typical of a child; silly and immature)
- It may be childish, but I love playing bumper cars.
- Stop this childish behavior; you’re a grown man now.
childlike
(having the good qualities of a child, such as trusting people, being honest, etc.)
- She has a childlike quality that I find charming.
- He trusts everyone with childlike simplicity.
Great!
It’s so clear and useful.