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1-It won't be good to do anything. We should just sit and wait.
2-To do anything would be bad. We should just sit and wait.
3-To do anything won't be good. We should just sit and wait.
1-It won't be good to do anything. We should just sit and wait.
2-To do anything would be bad. We should just sit and wait.
3-To do anything won't be good. We should just sit and wait.
They sound pretty odd to me, sorry. And I can't seem to get a handle on what would sound right.
I'd say the simplest solution would be to replace "anything" by "something". What do you think about that?
One could of-course say: "It wouldn't be right to act"; or "to take action", I suppose, but then the question wasn't really about that.
But I am still not sure the sentences are grammatically wrong. I agree with you that they are odd though, but I think you also hesitate to qualify them as wrong.
anything 
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