preposterous
/prɪˈpɔstərəs; prɪ`pɑstərəs/ adj
completely contrary to reason or common sense; absurd or outrageous 完全违背理性或常识的; 荒谬的; 反常的; 愚蠢的; 无法容忍的
That is a preposterous accusation! 那样的指责简直荒谬可笑!
They are asking a preposterous price for the work. 他们为该作品漫天要价.