I'm getting bored of repeating the same "I can't answer that" phrase over and over.
I'm trying other phrases, like "I'll leave that to your imagination," but that one sounds too weird.
Specifically, I'm not trying to avoid answering a question (so deflecting it is not in the question). I'm trying to reply to a question by asserting it's one I cannot answer, and that the asker should understand this.
I'm looking for both formal and informal phrases.