Vice is a practice, behavior, or habit generally considered immoral, sinful, depraved, or degrading in the associated society. In more minor usage, vice can refer to a fault, a negative character trait, a defect, an infirmity, or a bad or unhealthy habit (such as an addiction to smoking). Synonyms for vice include fault, sin, depravity, iniquity, wickedness, and corruption. The opposite of vice is virtue.