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

sinfully

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