weak
adjective uk/wiːk/ us/wiːk/
(NOT STRONG)
B1 （身体）虚弱的，无力的
not physically strong
It's not surprising you feel weak if you haven't eaten properly for days. 如果你几天都没有好好吃东西的话，觉得虚弱无力是很自然的。
The electromagnetic field strength becomes weaker as you move further away from high voltage cables. 当你远离高压线时，电磁场强度就会变弱。
意志薄弱的;怯懦的，无决断力的
not strong in character, so that you are not able to make decisions or to persuade or lead other people
He was a weak king surrounded by corrupt advisers. 他是个软弱无能的国王，身边都是些腐败的顾问。
（论据等）不充分的，无说服力的
A weak argument or excuse is one that is not likely to be accepted or believed.
Any evidence that exists to support the hypothesis is fairly weak. 现有的支持这种假设的证据都相当缺乏说服力。
He gave the weakest of excuses when asked why he was late. 当被问及为何迟到时，他给出了一个极其牵强的理由。
B2 （饮品）稀的，味淡的
A weak drink contains a lot of water compared to its other contents, so that it does not have a strong flavour.
I can't stand weak coffee. 我喝不了淡咖啡。
chemistry specialized（酸或碱）弱电解的，弱电解质的
A weak acid, alkali, or chemical base does not produce many ions (= atoms with an electrical charge) when it is dissolved in water.
- More examples
- He's still feeling a bit weak after his operation.
- The team has a strong attack, but its defence is weak.
- My ankle is rather weak, so I always put a bandage on it to support it when I play tennis.
- How do you like your tea - strong or weak?
- We could just pick out the path in the weak beam of the torch.
(NOT GOOD)
B1 不符合标准的;不够好的;能力不够的
not good enough, especially in ability, skill, or quality
He was always weak at/in languages but strong in science. 他一向在语言方面不擅长，但理科很拿手。
Our quiz team is a bit weak on sport. 我们的竞答小组在体育运动方面有点儿弱。
In the end I think the film was spoilt by a weak story line. 最后，我认为这部电影被糟糕的故事情节给毁了。
(CHIN)
usually disapproving（下巴）小的，不凸出的
A weak chin is small and does not stick out from the face.
Idiom
weak at the kneesidiom （通常指因看到或谈到非常喜欢的人或让人害怕的事而）膝盖发软的，腿发软的
If you go weak at the knees, you lose your strength and feel you are going to fall over, usually because of seeing or talking about either someone you are very attracted to or because of something unpleasant or frightening.
The thought of kissing him made me go weak at the knees. 吻他的念头让我膝盖发软。