Definition of suspiciously adverb from the Oxford Advanced American Dictionary

     

    suspiciously

     adverb
    adverb
    NAmE//səˈspɪʃəsli//
     
     
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  1. 1in a way that shows you think someone has done something wrong, illegal, or dishonest The man looked at her suspiciously.
  2. 2in a way that makes people think something wrong, illegal, or dishonest is happening Let me know if you see anyone acting suspiciously. Everything was suspiciously quiet.
  3. 3in a way that shows you think there may be something wrong with something She eyed the fish on her plate suspiciously.
  4. Word Familysuspect verbsuspected adjectivesuspicion nounsuspicious adjectivesuspiciously adverbsuspect noun adjectiveIdioms
    look/sound suspiciously like something(often humorous)
     
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    to be very similar to something Their latest single sounds suspiciously like the last one.
See the Oxford Advanced Learner's Dictionary entry: suspiciously