dumbfounded

Meanings

1. 1
   adj

   so astonished or bewildered that one is temporarily unable to speak or react

   The researchers were dumbfounded when the supposedly extinct plant began to flower.

A past-participial adjective from dumbfound, a seventeenth-century blend of dumb (in its older sense "unable to speak") and confound. It originally described someone struck silent by confusion or surprise.

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