stonewall

To engage in delaying tactics; stall.

To refuse to answer or cooperate.

To play defensively rather than trying to score in cricket.

To refuse to answer or cooperate with; resist or rebuff.

A refusal to cooperate.

To refuse to answer or cooperate, especially in supplying information.

Certain, stone cold.

engage in delaying tactics or refuse to cooperate

obstruct or hinder any discussion