C2 无可奉告。
used to say that you do not want to answer someone's question
His publicist replied with a firm "No comment".
If anyone asks me about my father, I just say, "No comment".
"Were you in the area at the time of the assault?" "No comment."
"Sir, what is your response to allegations of corruption?" "No comment."
All this trouble would have been avoided if she had simply responded "no comment".
See also: comment noun