sequentially Antonyms

at one go on a dime in the same breath in one fell swoop at one stroke at a stroke asudden all of the sudden earlier precedingly before you know it almost at the same time at one fling all in one go all at one time at the same moment in one breath at warp speed at the speed of light simultaneously at one time at the same time directly beforehand before apace anteriorly antecedently ahead afore former formerly all together all of a sudden all at once at once instantaneously priorly prior previously abruptly