agonizingly

from WordNet (r) 3.0 (2006)

agonizingly
    adv 1: in a very painful manner; "the progress was agonizingly
           slow" [syn: {agonizingly}, {excruciatingly},
           {torturously}]

from The Collaborative International Dictionary of English v.0.48

Agonizingly \Ag"o*ni`zing*ly\, adv.
   With extreme anguish or desperate struggles.
   [1913 Webster]

from Moby Thesaurus II by Grady Ward, 1.0

59 Moby Thesaurus words for "agonizingly":
      abominably, awfully, baldly, balefully, bitterly, blatantly,
      brashly, confoundedly, cruelly, damnably, deadly, deathly,
      deplorably, deucedly, distressfully, distressingly, dolorously,
      dreadfully, egregiously, excessively, excruciatingly, exorbitantly,
      extravagantly, flagrantly, frightfully, grievously, harrowingly,
      heartbreakingly, hellishly, horribly, improperly, inexcusably,
      infernally, inordinately, intolerably, lamentably, miserably,
      nakedly, openly, painfully, pathetically, piteously, pitiably,
      ruefully, sadly, shatteringly, shockingly, something awful,
      something fierce, sorely, staggeringly, terribly, torturously,
      unashamedly, unbearably, unconscionably, unduly, unpardonably,
      woefully