stun

[1]	daze , numb , benumb , knock out
[2]	astonish , daze , paralyse , stagger , stupefy , overcome , overwhelm , astound , jar , shock , jolt , strike dumb , amaze , confound , bewilder , take (someone's) breath away , (Colloq) shake up , bowl over , discombobulate , flabbergast