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1·He was not unintelligent, but he was lazy.

他并非不聪明，不过就是懒。《牛津词典》

2·Being dyslexic does not mean that one is unintelligent. Far from it.

诵读困难并不意味着人不聪明。绝非如此。《柯林斯英汉双解大词典》

3·Teenagers often struggle with an overwhelming sense that nobody likes them, that they're not as good as other people, that they are failures, losers, ugly or unintelligent.

青少年经常在一种压倒性的感觉挣扎，在这之中，没有人喜欢他们，他们不如其他人好，他们失败、丑陋或愚蠢。

4·He certainly was not unintelligent.

他绝对不傻。《柯林斯英汉双解大词典》

5·He believes him to be a weak and unintelligent man.

他相信自己是一个软弱的傻子。《柯林斯英汉双解大词典》

6·It appears to be unintelligent behavior.

这似乎是愚昧的行为。

7·In general, they are small and unintelligent.

通常，他们都是身材矮小、智能低下的种族。

8·The pact was unintelligent for another reason.

公约不合理还有另一个原因。

9·He is not so (much) unintelligent as uneducated.

与其说他不聪明，不如说他未受过教育。

10·To think in terms of 'much' is to be unintelligent.

考虑“多”这个词不是有才智的。

愚蠢的

1·Teenagers often struggle with an overwhelming sense that nobody likes them, that they're not as good as other people, that they are failures, losers, ugly or unintelligent.

青少年经常在一种压倒性的感觉挣扎，在这之中，没有人喜欢他们，他们不如其他人好，他们失败、丑陋或愚蠢。

不聪明的

1·He was not unintelligent, but he was lazy.

他并非不聪明，不过就是懒。《牛津词典》