feeble-minded 弱智的;低能的;愚笨的;意志薄弱的;优柔寡断的;无决断的

【例句】
The Eastern Pennsylvania State Institution for the Feeble-Minded and Epileptic opened in 1908 in East Vincent, Pennsylvania.
1908年，专门为智能低下以及癫邪症患者所开设的东宾夕法尼亚州立机构在滨州东文森特成立。

He's not feeble-minded. He's just blunt.
他不是低能，只是迟钝而已。