The Seven Deadly Sins are also a popular subject in fiction and are usually embodied as powerful demons or similiar monsters: Satan is often believed to embody all of the seven sins, though Pride is his most prominent feature.
In Garth Nix's fantasy series The Keys to the Kingdom, the Seven Morrow Days, the main antagonists of the series, respectively suffered from the sins after their betrayal.
The Seven Sins
Envy is the sin of wanting that which belongs to another person and often involves a feeling of ill-will towards said person, in simpler terms it can be seen as when someone resents another for having what they do not: whether it is property, beauty, family, friends or some other luxury, sometimes when they don't need it.
Gluttony is the sin of excessive eating and drinking, especially if it is seen as wasetful and even more so if one denies food to the needy to satisfy one's own unhealthy diet: many medieval royals and nobility could of been considered guilty of this sin, with Henry VIII of England being especially infamous for his wasteful attitude towards food (reportedly taking a single bite from a large rump of meat and throwing the rest away).
Sloth is sometimes mistaken for excessive laziness but in its original sense Sloth refered more to a spiritual apathy than physical laziness - for example, refusing to worship God or attend a holy place or neglecting to aid others out of ideleness could be considered signs of Sloth.
Wrath is the sin of excessive anger as well as those who seek to exact unjust revenge on others, this became especially important after the teachings of "turn the other cheek" came into place and revenge was seen as an unacceptable act (whilst in ancient times attitudes towards revenge were less severe, though even then those who took excessively cruel tactics in their quest for vengeance would be considered "wrathful")
Lust is the sin of excessive desire for the pleasures of the flesh, in many religions sex outwith that done to reproduce is either sinful or to be kept hidden - this made the subject of open sexuality a very controversial one and Lust was seen to be the manifestation of such behavior. In the modern world, where sexuality has become much more accepted, lust is regarded more as that which is abnormal or dangerous (such as perversion or lewd behavior in unacceptable circumstances).
Pride is the sin of excessive self-worth, comparable to vanity and/or arrogance - science has coined the term "Malignant Narcissist" to describe such individuals: who often act in very selfish and sometimes dangerous ways and putting themselves before others.
Greed is the sin of excessive love of material things such as money or power - some faiths have also coined the word "Mammon" to describe this particular sin.