bashful

She was very bashful [=shy] as a child.她小的时候很害羞。

bashful boys asking girls to dance邀请女孩们跳舞的腼腆男孩

He looked at her with a bashful smile. [=a smile that showed he was feeling bashful]他望着她，带着腼腆的笑。

Take another cookie if you like. Don't be bashful. [=shy]如果喜欢吃的话就再拿一块饼干，别不好意思。