He looks the better for his rest. 形容词比较级前能用定冠词 the 吗？如果能用，那么它的含义是什么？
这里的 the 并不是定冠词, 而是副词。the more...for (because of, because, on that account) 的语义为: “因……而更加”。其否定式 not (none, never) the more...for (because of, because, on that account) 的语义是: “并不因……而更加”, 如果没有 for (because of, on that account, because) 引出的原因状语, 则 the 作“因此”“靠此”解:
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I'm glad you decided to take a walk. You'll work the better for it. (Cronin) 我很高兴你决定去散步，你会因此工作得更好。
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I am the more inclined to believe him because he has nothing to gain by concealing the truth. (Wood) 由于他隐瞒真实情况不会得到任何好处,所以我更加相信他。
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I'm none the wiser for your explanation. 我听了你的解释,还是不明白。
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He's none the worse for his fall from the window. 他从窗户摔下来,但并没有受伤。
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She is no use, but I love her none the less. 她虽无用,但我仍然爱她(但我并不因此而不爱她)。
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Your mother is an unmarried woman, I do not respect her the less on that account. (Shaw) 你母亲是个未婚女人，但我并不因此而不尊敬她。
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Crows are never the whiter for washing themselves. (Prov) 乌鸦是洗不白的。
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If a person was reputed to be rich, he was the more disposed to excuse his faults. 如果一个人因富有而出了名，他就会因此而更加容易原谅自己的缺点。