“使显得愚笨”可以用英语表达为 “make (someone) appear foolish/stupid” 或 “render (someone) foolish-looking/stupid-appearing”（后者较为正式或书面）。其中，最常用且自然的表达是 “make someone appear foolish” 或 “make someone look stupid”。
例句：His constant interruptions made him appear foolish in front of the audience. （他不断的打断让他在观众面前显得很愚笨。）
Don't try to show off; it will only make you look stupid. （别试图炫耀了，那只会让你显得很蠢。）