Lust: The obsession with personal gratification and/or pleasure. This does not have to be sexual, but it usually is.
Wrath: Different from Anger, Wrath is the uncontrolled hatred for someone or something, and the unquenchable desire to exact revenge on said object/person. The wrathful person feels he *must* seek retribution on the focus of his anger, and is usually so consumed by his rage, that they usually cannot calm down after their revenge is complete.
Greed: The tendency to want more than you need. This can be wealth, power, sexual gratification (see Lust), etc. Usually, greedy people seek to add to their collection, through any way possible, and with no regard to others. It doesn't matter if others need the money, power, etc. to survive; If the greedy person sees it, he/she will do anything to acquire it.
Sloth: Extreme laziness. Slothful people feel that everything should be done for them, and will refuse to do anything for themselves. Such people would usually not get a job, even if they need to; sleep for most of the day, and then lounge around for the rest of it; etc. They have no desire to do anything that would require any ammount of effort or work, and would usually pass off those responsibilities to other people.
Envy: Having an unusual interest in another's abilities, personality, luck, etc., and an unusually strong jealousy towards said person, because of those traits. This causes the envious person to copy the object of their envy, and/or trying everything they can to acquire what the object of their envy has.
Gluttony: Similar to Greed, it is the consumption of something to excess. Instead of merely acquiring the object, it is absorbed and depleted, usually until there is nothing left. Usually used in reference to the consumption of food, it can also be used to describe the consumption of a natural resorce, funds, charity, etc., until there is nothing left for use, usually denying others from using that same resorce.
Pride: Interchangable with Vanity, Pride is the overexaggerating of one's abilities or accomplishments. Prideful people usually inflate their own worth far over what it should be, and in the process, overinflate their egos, as well. They tend to act high-and-mighty, and consider themselves of far more importance to people than they really are.
Greed is also known as Bill Gates.
Envy is wanting your best friend's boyfriend, even though he hates your guts, and trying to seduce him, anyway.
Wrath is killing a cop, because he gave you a ticket on a bad day of yours.
Sloth is living in your parents basement, still paying video games, when you're 45.
Pride is better known as the Bush Administration.
Gluttony is better known as Bill Gates at the local supermarket's snack aisle.