sin·ful 
/ˈsɪnfəl/ adjective
/ˈsɪnfəl/ adjective [more sinful; most sinful] 1 : wrong according to religious or moral law
▪ a sinful act [=an act that is a sin] ▪ It is sinful to steal. 2 : very bad or wicked
▪ sinful people 3 informal : extremely enjoyable in a way that makes you feel guilty
▪ a sinful chocolate cake
▪ a sinful act [=an act that is a sin] ▪ It is sinful to steal.
▪ sinful people
▪ a sinful chocolate cake
— sin·ful·ly adverb
▪ They acted sinfully. ▪ The cake is sinfully delicious. ▪ sinfully rich chocolate
▪ They acted sinfully. ▪ The cake is sinfully delicious. ▪ sinfully rich chocolate
— sin·ful·ness noun [noncount]
