Meaning of “sinful” in the English Dictionary

"sinful" in British English

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uk /ˈsɪn.fəl/ us /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.

informal used to refer to something that is very pleasant, but very bad for you:

This cake is sinful!
adverb uk /ˈsɪn.fəl.i/ us /ˈsɪn.fəl.i/
noun [ U ] uk /ˈsɪn.fəl.nəs/ us /ˈsɪn.fəl.nəs/

(Definition of “sinful” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"sinful" in American English

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us /ˈsɪn·fəl/

wrong according to a religious law:

We all know that what he did is sinful, but it may not be illegal.

Sinful also means wrong:

It’s sinful to waste food.

(Definition of “sinful” from the Cambridge Academic Content Dictionary © Cambridge University Press)