Speechless

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Old English spǣclēas (see speech, -less).

wiktionary

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From Middle English specheles, from Old English sprǣċlēas(“speechless; without the power of speak”), from Proto-Germanic *sprēkalausaz, equivalent to speech +‎ -less. Cognate with West Frisian sprakeleas(“speechless”), Dutch sprakeloos(“speechless”), German Low German spraaklos(“speechless”), German sprachlos(“speechless”).

etymonline

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speechless (adj.)

Old English spæcleas "permanently mute;" see speech + -less. Meaning "mute by effect of astonishment" is from late 14c. Related: Speechlessly; speechlessness.