1. sinless, virtuous; faultless, impeccable, spotless, immaculate. 2. Innocent, blameless, guiltless imply freedom from the responsibility of having done wrong. Innocent may imply having done no wrong at any time, and having not even a knowledge of evil: an innocent victim. Blameless denotes freedom from blame, especially moral blame: a blameless life. Guiltless denotes freedom from guilt or responsibility for wrongdoing, usually in a particular instance: guiltless of a crime. 6. simple, naive, unsophisticated, artless.