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Adverb: inexplicably  ,i-nik'spli-ku-blee
  1. In a manner differing from the usual or expected
    "her talkative friend was inexplicably quiet that morning";
    - curiously, oddly, peculiarly, strangely
     
  2. In an unexplained or unexplainable manner
    "The usually punctual employee inexplicably failed to show up for work"

Encyclopedia: Inexplicably, but the fact