The Collaborative International Dictionary of English v.0.48:

Hastily \Has"ti*ly\ (h[=a]s"t[i^]*l[y^]), adv. [From Hasty.]
   1. In haste; with speed or quickness; speedily; nimbly.
      [1913 Webster]

   2. Without due reflection; precipitately; rashly.
      [1913 Webster]

            We hastily engaged in the war.        --Swift.
      [1913 Webster]

   3. Passionately; impatiently. --Shak.
      [1913 Webster]

WordNet (r) 3.0 (2006):

hastily
    adv 1: in a hurried or hasty manner; "the way they buried him so
           hurriedly was disgraceful"; "hastily, he scanned the
           headlines"; "sold in haste and at a sacrifice" [syn:
           hurriedly, hastily, in haste] [ant: unhurriedly]

Moby Thesaurus II by Grady Ward, 1.0:

130 Moby Thesaurus words for "hastily":
   a corps perdu, abruptly, agilely, amain, apace, at flank speed,
   at half cock, at once, bang, by forced marches, carelessly,
   cursorily, dash, desperately, directly, double-quick,
   expeditiously, fast, feverishly, flat-out, furiously,
   hand over fist, hand over hand, happen what may, head over heels,
   headfirst, headforemost, headlong, heedlessly, heels over head,
   hell for leather, hell-bent, hell-bent for election,
   helter-skelter, holus-bolus, hotfoot, hotheadedly, hurriedly,
   hurry-scurry, immediately, impetuously, impulsively, in a flash,
   in a rush, in a wink, in double time, in double-quick time,
   in high, in high gear, in passing, in seven-league boots,
   incautiously, instantaneously, instantly, lickety-cut,
   lickety-split, like a flash, like a shot, like a thunderbolt,
   like crazy, like greased lightning, like mad, madly, nimbly,
   of a sudden, on short notice, on the double, on the run,
   overeagerly, overenthusiastically, overhastily, oversoon,
   overzealously, pell-mell, plop, plump, plunk, pop, post, posthaste,
   precipitantly, precipitately, precipitously, prematurely, promptly,
   pronto, quick, quickly, ramble-scramble, rapidly, rashly,
   recklessly, right away, sharp, slam-bang, slap, slap-bang,
   slapdash, smack, snappily, speedily, startlingly, sudden, suddenly,
   superficially, surprisingly, swiftly, thoughtlessly, too early,
   too soon, trippingly, unawares, under forced draft, unexpectedly,
   unpremeditatedly, unthinkingly, untimely, wantonly, whip and spur,
   wildly, with a rush, with all haste, with dispatch,
   with giant strides, with haste, with rapid strides, with speed,
   without delay, without notice, without warning