Como dizer que a Pessoa é boba em inglês

Sometimes you find "silly in a good way"/"completely silly in a good way"/"crazy silly, in a good way."
I also found "plain silly (in a good way).

There is also a mild 'mocking' that mothers, aunts, etc, make in jest or in a loving way:

“Oh little silly, ” her mother said when they were washing down at the river. “You can not be a movie star. You are too little and you have rough skin.

Spoiler:
Her brothers mocked her, taunted her for her nose, movies? No way. Her aunts, her family...
But she didn't give up, and turned into the most sought-after elephant in the Bollywood movies!

Se o contexto for que a pessoa é boba, sinônimo de inocente, então a palavra é naive.

Ditsy
Silly
Goofy
...