"childlike" in the adjective sense
1. childlike, childly
befitting a young child
"childlike charm"
2. childlike, wide-eyed, round-eyed, dewy-eyed, simple
exhibiting childlike simplicity and credulity
"childlike trust"
"dewy-eyed innocence"
"listened in round-eyed wonder"
Source: WordNet® (An amazing lexical database of English)
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