so surprising that it is difficult to believe synonym astonishing令人震惊的;使大吃一惊的 There was an astounding 20 per cent increase in sales. 销售额惊人地增长了20%。 The performance was an astounding success. 这场演出获得了惊人的成功。 They can perform astounding mathematical feats in seconds. 他们可以在几秒钟内完成惊人的数学壮举。