One of the FallaciousArguments. Actually, this one isn't an argument at all--it's the practice of ducking a question that one cannot, or would prefer not, answer.
Ways to avoid the question. Often these are combined for greater effect.
- Attack the speaker--ArgumentAdHominem
- Respond with a question of your own--expecting the speaker to answer your question before you answer his.
- Question the legitimacy of the question (sometimes this is legitimate)
- Use a defense such as "isn't it obvious?" or "Everyone knows that"
- Attempt to change the subject
- Provide a non-answer (or a vague generalization that may or may not apply to the particular question--and which if it does, can be denied later).
- Provide generic references to the literature or some other authority
- Terminate the discussion ("Sorry, I have to go now..."). Especially popular with talk-show hosts.
- Answer the question you wish had been asked instead. The answer should be long enough that the real question is forgotten. Especially popular with politicians.