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Adverb: surreptitiously  ,sur-up'ti-shus-lee or ,sú-rup'ti-shus-lee [N. Amer], ,sú-rup'ti-shus-lee [Brit]
  1. In a surreptitious manner; secretly
    "he was watching her surreptitiously as she waited in the hotel lobby";
    - sneakily, clandestinely