Less Smarter Or Less Smart?

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1. He is less smarter than her.
2. He is less smart than her.

which one is correct?
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He is less smart than she is.
He is less smart than she.
He is less smart than her.

All of these are fine.
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Students: We have free audio pronunciation exercises.
Is "less smarter" wrong???
Yes, as is 'less more smart'.

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