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Could you explain this sentence. What does this sentence mean - She is stupid to ask.

1) It is stupid of her to ask.
2) It is stupid to ask her.

Compare
He is hard to please = It is hard to please him.

Then
She is stupid to ask - must mean - It is stupid to ask her.
Comments  
TicceCould you explain this sentence. What does this sentence mean - She is stupid to ask.
1) It is stupid of her to ask. - She should know the answer, so is considered stupid for asking.
2) It is stupid to ask her. - She won't know so why ask her.

Compare
He is hard to please = It is hard to please him.
ThenShe is stupid to ask - must mean - It is stupid to ask her.- no!

Dave, I think s/he wants to know the meaning of this sentence.

She's stupid to ask.

Tom
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Thank you Dave for paying attention to my question. It would be great if you could explain why

He is hard to please. = It is hard to please him.

He is difficult to understand. = It is difficult to undersatnd him.

He is easy to notice. = It is easy to notice him.

He is pleasant to work with. - It is pleasant to work with him.

But

She is stupid to ask DOESN"T EQUAL It is stupid to ask her.

Technically they are the same. So what makes them different? The verb ASK?
Tom if you don't know a gender you can always use a name otherwise you treat me as "it"
TicceTom if you don't know a gender you can always use a name otherwise you treat me as "it"

Ticce, Tom was being polite when he said s/he. That is how address a unknown gender in the 3rd person. It would have been very rude. You are right using a name is better but Tom won't see your name when replying to me. We answer so many posts remembering everybody's name and how to spell it isn't possible.

Back to your question, all your examples use the word to. However here you use to in one sentence and for in another.
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Sorry I couldn't edit my last post. You use of rather than for.

As I said we read so many posts they can get confused.