not physically or mentally strong, especially through age or illness
(尤指因年老、疾病而)体虚的;脆弱的。
〈古〉 (人,判断力)软弱的;犹豫不决的,优柔寡断的
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he was infirm of purpose .他意志薄弱。
"late Middle English (in the general sense ‘weak, frail’): from Latin