What is the meaning of stupefying?

verb

• Make dull or stupid or muddle with drunkenness or infatuation.
  • synonyms: besot, stupefy
• Be a mystery or bewildering to.
  • usage: "This beats me"; "Got me-I don't know the answer"; "a vexing problem"; "This question really stuck me"
  • synonyms: perplex, vex, stick, get, puzzle, mystify, baffle, beat, pose, bewilder, flummox, stupefy, nonplus, gravel, amaze, dumbfound
• Make senseless or dizzy by or as if by a blow.
  • usage: "stun fish"
  • synonyms: stun, stupefy

adjective

• So surprisingly impressive as to stun or overwhelm.
  • usage: "such an enormous response was astonishing"; "an astounding achievement"; "the amount of money required was staggering"; "suffered a staggering defeat"; "the figure inside the boucle dress was stupefying"
  • synonyms: astonishing, astounding, staggering
• Making physically stupid or dull or insensible.
  • usage: "a stupefying blow to the head"; "the stupefying effects of hemp"
• Shocking with surprise and consternation.
  • usage: "the stupefying impact of the tragedy"