As a Noun: 1. The unhappy feeling you have when you believe you have done something wrong. English = guilt. Formal English = remorse. 2. An action that is believed to be vary bad and immoral, especially one that breaks the rules of a religion. English = sin. 3. A person who does something that is believed to be vary bad and immoral, especially breaking the rules of a religion. English = sinner. As a Verb or Adjective: 1. To feel unhappy because you believe you have done something wrong. English = feel guilty, (be) guilty. Formal English = (be) culpable. 2. To be officially found to have committed a crime or offence, especially in a court of law. English = (be) guilty. 3. To acknowledge guilt or accept blame for something. 4. To do something that is believed to be very bad and immoral, especially according to a religion. English = sin.