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had been dumbfounding

  • past perfect progressive
    of dumbfound.
    dumbfound
    verb (used with object)
    to make speechless with amazement; astonish.

Example Sentences

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The dear, good-meaning, no-thinking creature had been dumbfounding a company of us with a detail of inextricable difficulties in which the circumstances of an acquaintance of his were involved.

From The Atlantic Monthly, Volume 11, No. 67, May, 1863 by Various