IPA: /ˈsɪn.fəl/
KK: /ˈsɪn.fəl/
Describing something that is morally wrong or bad, often in a religious context.
He felt guilty for his sinful actions.
Sinful → It is formed from "sin" (from Old English "syn", meaning wrongdoing or transgression) and "-ful" (meaning full of). The word "sinful" means full of sin or characterized by wrongdoing.
Think of 'sin' as wrongdoing and remember that 'sinful' means full of wrongdoing.