sinnoun [ C or U ]uk /sɪn/ us /sɪn/
He thinks a lot about sin.
[ + to infinitive ] informal I think it's a sin (= is morally wrong) to waste food, when so many people in the world are hungry.
adjective uk /ˈsɪn.ləs/ us /ˈsɪn.ləs/
(Definition of “sin” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)
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