1. (举止或行为)愚蠢的，傻的，笨的
    If someone's behaviour or action is foolish, it is not sensible and shows a lack of good judgment.

    e.g. It would be foolish to raise hopes unnecessarily...
           无谓地燃起人们的希望是愚蠢的。
    e.g. It is foolish to risk skin cancer.
           冒患上皮肤癌的风险是愚蠢的。

2. 傻的;蠢的;显得难堪的
    If you look or feel foolish, you look or feel so silly or ridiculous that people are likely to laugh at you.

foolish在线翻译

    e.g. I just stood there feeling foolish and watching him...
           我只是傻傻地站在那里看着他。
    e.g. I didn't want him to look foolish and be laughed at.
           我不希望见到他出丑，被别人嘲笑。