Doubts regarding kufr

I know someone who has bad thoughts, that he does not want, but they keep coming back and now he is confused about a particular situation. He had bad thoughts and he did not intend to say anything, but he worries because when he exhaled he thinks he heard part of the bad thoughts come from his mouth or like a motion on the tongue or he said part of it under his breath without wanting to say that. So the question is : If somebody has a thought of kufr and they said part of it or all of it without intending to or wanting to and they are angered by it, does this count as kufr?