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