If you are speechless, you are temporarily unable to speak, usually because something has shocked you.
例句
Alex was almost speechless with rage and despair.亚历克斯又生气又绝望，几乎说不出话来。
英汉词典释义
adj.
(由于强烈的感情、震惊等)说不出话的
He was almost speechless with anger.他气得几乎说不出话来。Rachel stood speechless.雷切尔站在那儿一言不发。The leaders of the Kopper Company were then stunned speechless.科伯公司的领导们当时被惊得目瞪口呆。