A statement that does not logically fit into the current conversation. Good luck getting answers from him—his every response to my questions so far has been a non sequitur.A: "I changed the oil in the car." B: "Well, that's a complete non sequitur, since I asked if you were hungry!"
a statement which does not seem to be connected with what has just been said 'Have you arranged for us to visit Eileen?' I asked. 'But I thought you were coming by train', said Gwen, in what seemed a complete non sequitur.