Sincere: to be honest and trustworthy.
真诚（sincere）：诚实的，可信的。
I think she was being sincere, so I think we can trust her.
我觉得她很真诚，所以我们可以信任她。
Sometimes it's very difficult to know if someone is being sincere or it's just a good liar.
有时候很难知道一个人是真诚，还是只是一个演技出色的骗子。
Naive: overly simple and lacking experience.
单纯（naive）：过于单纯且缺乏经验。
He wants to change the world, but he's very naive, so he needs someone to help him.
他想改变世界，但是他太天真了，所以他需要有人帮助他。
I think we can take advantage of him, because he is naive and impatient.
我想我们可以利用他，因为他又天真又没耐心。
Brilliant: highly intelligent or exceptional in brightness; the opposite of dull.
杰出的（brilliant）：非常聪明；迟钝（dull）的反义词。
There is no doubt that he is a brilliant scientist, but he is a very poor manager.
毫无疑问，他是个有杰出的科学家，但他是个很差劲的管理者。
It's amazing how such a brilliant man can be so stupid around women!
一个如此杰出的男人在女人面前竟然如此愚蠢，真是不可思议!
Cruel: mean, manipulative and hurtful; The opposite of kind.
冷酷（cruel）：刻薄、控制欲强、伤人的；友好（kind）的反义词。
He can be cruel when he doesn't like someone, so don't expect him to be nice to you.
他不喜欢一个人时会很冷酷，所以不要指望他对你好。
I was shocked by how cruel he was when he fired her.
当他解雇她时，我对他的冷酷感到震惊。
Clever: innovative, creative, very smart.
智慧（clever）：创新的，有创造力的，非常聪明。
He found a clever solution that allowed us to reduce costs.
他找到了一个聪明的解决办法，使我们能够降低成本。
Advertisers are very clever at getting people to buy things they don't really need.
广告商在让人们购买他们并不真正需要的东西方面非常聪明。
Skeptical: needs proof or evidence to overcome doubts; the opposite of convinced.
可疑（skeptical）：需要证据来消除怀疑；信服（convinced）的反义词。
I'm sure they will be skeptical of our results, so we need to bring convincing evidence.
我确信他们会怀疑我们的结果，所以我们需要有令人信服的证据。
I'm skeptical that such a simple design can satisfy our requirements.
我怀疑这样简单的设计是否能满足我们的要求。
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