speechlessly

/ˈspiːtʃləsli/
without being able to speak, especially because you are extremely angry or surprised.

adverb [方式副词] 一时不知怎么说地;哑口无言地

She stared at him speechlessly. 她无言地盯着他。

后缀: lessly 【adverb】 没有某种特性或质量 - without a particular quality or attribute 原词: speechlessly 是通过后缀 【lessly】 构成的派生词
单词造句: