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English definition of “sinful”

sinful

adjective     /ˈsɪn.fəl/
against the rules of a religion or morally wrong: He confessed that he had sinful thoughts. Buying that sports car was a sinful waste of money.Morally wrong and evilDishonestSin informal describes something that is very pleasant, but very bad for you: This cream cake is sinful!Bad but attractive sinfully     /-i/ adverb Morally wrong and evilDishonestSin sinfulness     /-nəs/ noun [U] Morally wrong and evilDishonestSin
(Definition of sinful adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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