“愚蠢”常见的英语表达有“stupid” /ˈstuːpɪd/、“foolish” /ˈfuːlɪʃ/、“silly” /ˈsɪli/。“stupid”语气较强，指人智力低下、愚笨，也可指行为愚蠢可笑；“foolish”侧重缺乏智慧或判断力，行为愚蠢；“silly”较口语化，常指人头脑简单、傻气，也可形容幼稚可笑的行为。例如：It's stupid to make such a mistake.（犯这样的错误很愚蠢。）Don't be so foolish.（别那么愚蠢。）You are being silly.（你真傻。）
