bang, directly, forthwith, headlong, immediately, incontinently, instantaneously, instanter, now, PDQ, plumb, presently, promptly, pronto, right, right away, right now, right off, straight off, straightaway, straightway

away, freelyanon, momentarily, shortly, soonapace, briskly, fast, fleetly, full-tilt, posthaste, quick, quickly, rapidly, readily, snappily, speedily, swift, swiftlyabruptly, presto, suddenly, unexpectedlyhastily, impetuously, impulsively, rashly, recklesslyexactly, opportunely, punctually, seasonably

at once, in no time, off the bat, on a dime, on the double, on the spot