I would say: "How's that related to my question ?" Please answer for both formal and informal cases

  • Is it relevant that the first utterance should be a question, and the second an answer (albeit not "recognised" as an answer by the first speaker)? I'm specifically asking that because a non-sequitur doesn't normally have any implications of "not an answer to the question just asked" - it just means "not meaningfully connected to preceding utterances" (usually, within the context of a conversation, not an interrogation). – FumbleFingers Dec 22 '20 at 17:31
  • (1) Non/germane / Off-topic / Going off at a tangent / Digress / a non-sequitur (2) Sidetrack – Edwin Ashworth Dec 22 '20 at 17:31
  • Does this answer your question? Formal expression for "talking about something unrelated" (one answer has a list graded from informal to formal). – Edwin Ashworth Dec 22 '20 at 17:32
  • The usual answer when that happens is "Why do you say that?" – John Lawler Dec 22 '20 at 17:33
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    Also What do you call a response which does not address the question? - which going by the title should be a pretty good match! – FumbleFingers Dec 22 '20 at 17:34