一些青少年很幼稚，经常做出愚蠢的行为。

Some teenagers are ___immature and often act foolishly.

人们可能认为我很幼稚，因为我仍然喜欢幼稚的爱好。

People might think I'm ___immature because I still enjoy childish hobbies.

他在会议中幼稚的行为很不专业，惹恼了所有人。

His ___immature behavior during the meeting was unprofessional and annoyed everyone.