having the qualities that children usually have, especially innocencechildlike enthusiasm/simplicity/delightcomparechildishOxford Collocations DictionaryChildlike is used with these nouns: delight,excitement,innocence,…Seefull entryExtra examplesShe spoke, as always, with an almost childlike directness.His eyes were light blue and childlike in their innocence.She responded with childlike simplicity.
See childlike in the Oxford Advanced American Dictionary
