Here are examples of the word/phrase "juvenilely" used in a sentence and paraphrased in a sentence...
He's usually goofy but I hope he doesn't act juvenilely at the meeting.
He's usually goofy but I hope he doesn't act childishly at the meeting.
Those out of timing jokes are an example of how juvenilely Wade can act some times.
Those out of timing jokes are an example of how puerilely Wade can act some times.
Other Examples...