not the sharpest tool in the shed
不是最聪明的人；理解能力较差
口语·委婉说人笨
英文释义
not very intelligent; lacking in intelligence
例句
He tried to fix the computer with a hammer—definitely not the sharpest tool in the shed.
典故来源
源自工具比喻，'sharp'双关聪明与锋利，指某人不够聪明，流行于20世纪英语国家。