You can't delete it but you can disavow it which is a tiny bit similar. When you disavow a question, it remains anonymous and you won't get further notifications on it. To disavow a question, go to your profile, click on 'Questions' and then click on the third icon on the bottom of the question you want to get disavowed.
You cannot deleted a question once it is asked unless it is removed for violating the site's rules. You can go anonymous on the question if that helps. After some time, you can disavow the question as well. See the link below on how and when you can do that.