take aback Synonyms

shock floor amaze stagger startle stun stupefy surprise throw unnerve strike dumb shake up dumbfound ball over blow out of the water bowl over blow away leave aghast shake rock overwhelm astound astonish bewilder boggle confound daze discompose disconcert dismay disorientate disturb faze flabbergast horrify jolt nonplus leave open-mouthed