mysteriously

from WordNet (r) 3.0 (2006)

mysteriously
    adv 1: in a cryptic manner; "we will meet again," he said
           cryptically [syn: {cryptically}, {enigmatically},
           {mysteriously}]

from The Collaborative International Dictionary of English v.0.48

Mysteriously \Mys*te"ri*ous*ly\, adv.
   In a mysterious manner.
   [1913 Webster]

from Moby Thesaurus II by Grady Ward, 1.0

26 Moby Thesaurus words for "mysteriously":
      awe-inspiringly, awesomely, awfully, awingly, bizarrely, eerily,
      enigmatically, fancifully, fantastically, grotesquely,
      inexplicably, monstrously, mystically, numinously, outlandishly,
      peculiarly, quaintly, queerly, singularly, strangely,
      supernaturally, unaccountably, uncannily, undefinably,
      unexplainably, weirdly