1) Amaze 2) Astonish 3) Astound 4) Awe 5) Boggle 6) Daze 7) Floor 8) Knock for a loop 9) Shock 10) Stun 11) Stupefy 12) Surprise 13) Wow 1) Astound 2) Boggle 3) Bowl over 4) Overcome with amazement 5) Surprise 
• (v. t.) To astonish; to strike with wonder, esp. by extraordinary statements.
Flab'ber·gast transitive verb [ Confer Flap , and Aghast .] To astonish; to strike with wonder, esp. by extraordinary statements. [ Jocular] Beaconsfield. 
[v] - overcome with amazement
boggle verb overcome with amazement; `This boggles the mind!`
to overcome with surprise and bewilderment; astound.