Definition of sinfully adverb from the Oxford Advanced Learner's Dictionary

     

    sinfully

     adverb
    adverb
    BrE BrE//ˈsɪnfəli//
     
    ; NAmE NAmE//ˈsɪnfəli//
     
     
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  1. 1(formal) in a way that is morally wrong or evil synonym immorally
  2. 2(informal, often humorous) in a way that is slightly bad a sinfully delicious cheesecake