has been dumbfounding

• present perfect progressive

  present perfect progressive

  Used to describe an action that began in the past, has continued continuously, and is still in progress.

  of dumbfound (3rd person singular).
  dumbfound

  verb (used with object)

  to make speechless with amazement; astonish.

Related Words

• amaze
• astonish
• bewilder
• boggle
• confound
• flabbergast
• nonplus
• puzzle
• startle
• stun