headlong

1 with excessive or careless speed plunged headlong into the crowd in pursuit of the purse snatcher Synonyms cursorily, hastily, hotfoot, hurriedly, pell-mell, precipitately, precipitously, rashlyRelated Words headfirst, headily, hotheadedly, impatiently, impetuously, impulsively, recklessly, thoughtlessly; automatically, glancingly, haphazardly; impromptu, spontaneously; abruptly, suddenly; offhand, offhandedlyNear Antonyms calculatingly, circumspectly, designedly; falteringly, haltingly, hesitantly, hesitatingly, tentatively; leisurely, slowlyAntonyms deliberately, studiedly

2 without delay had barely finished the last project when we went headlong into the next one Synonyms bang, directly, forthwith, immediately, incontinently, instantaneously, instanter, instantly, now, PDQ, plumb, presently, promptly, pronto, right, right away, right now, right off, straightaway, straight off, straightwayRelated Words away, freely; anon, momentarily, shortly, soon; apace, briskly, fast, fleetly, full-tilt, posthaste, quick, quickly, rapidly, readily, snappily, speedily, swift, swiftly; abruptly, presto, suddenly, unexpectedly; hastily, impetuously, impulsively, rashly, recklessly; exactly, opportunely, punctually, seasonablyNear Antonyms slowly; late, tardily