Weak-minded works two ways, and they are close but not the same.

Weak-minded意志薄弱這個詞 works two ways有兩種用法，and而 they are close這兩種很接近 but卻 not the same不完全一樣。

First, it can mean not very intelligent — slow to think, unable to understand much. This use is old, and today it sounds unkind and out of date; you may meet it in older books, where it was almost a medical label for people we would now describe quite differently. Kind speakers avoid it in this meaning.

First第一，it它 can mean可以指 not very intelligent不太聰明——slow to think想得慢，unable to understand much不太能理解事情。This use這個用法 is old很舊了，and而 today今天 it sounds聽起來 unkind不親切 and和 out of date過時；you may meet it你可能會遇到它 in older books在舊書裡，where在那裡 it was almost它幾乎是 a medical label一種醫學標籤 for people用來稱呼 we would now describe quite differently我們現在會用很不同方式描述的人。Kind speakers有禮貌的人 in this meaning在這個意思上 avoid it會避免使用它。

Second, and much more common now, it means easily persuaded: a weak-minded person believes whatever they are told, follows the crowd, is talked into things, cannot hold on to their own opinion. That is the sense you will meet in modern writing — 'only a weak-minded person would fall for that advert'. Both uses are insults; you never call yourself weak-minded except as a joke about, say, buying too much chocolate.

Second第二，and而且 much more common now現在更常見，it它 means easily persuaded指的是容易被說服：a weak-minded person一個意志薄弱的人 believes whatever they are told別人說什麼都相信，follows the crowd跟著群眾走，is talked into things容易被說服去做事，cannot hold on to their own opinion無法堅持自己的看法。That is the sense這是意思 you will meet in modern writing你會在現代文章裡遇到的——'only只有 a weak-minded person意志薄弱的人 would fall for that advert才會上那個廣告的當'。Both uses兩種用法 are insults都是罵人的話；you never call yourself你絕不會說自己 weak-minded意志薄弱，except as a joke除非是開玩笑，about, say比如說 buying too much chocolate買太多巧克力這種事。

Compare weak-willed: weak-willed is about not doing what you planned, weak-minded is about not thinking for yourself. They overlap, and people are not always careful about the difference.

Compare跟...比較一下 weak-willed意志不堅：weak-willed意志不堅 is about說的是 not doing what you planned沒做到自己計畫的事，weak-minded意志薄弱 is about說的是 not thinking for yourself不自己思考。They overlap它們有重疊，and而 people人們 are not always careful about the difference不見得會仔細分辨其中的差別。