What is Stonewalling?

Legal Definition
Stonewalling is a refusal to communicate or cooperate. Such behaviour occurs in situations such as marriage guidance counseling, diplomatic negotiations, politics and legal cases. Body language may indicate and reinforce this by avoiding contact and engagement with the other party. The use of deflection in a conversation in order to render a conversation to be pointless and insignificant. Tactics in stonewalling include giving sparse, vague responses, refusing to answer questions, or responding to questions with additional questions. In most cases, stonewalling is used to create a delay compared to putting the conversation off forever.
-- Wikipedia
Legal Definition
The delaying tactics used to refuse to co-operate or answer questions.