A bully is anyone who uses power and intimidation to control or overpower someone else. Bullies can affect the lives of others profoundly, which is how they derive their power. They feed off the energy of other people's fear and intimidation, and steal power from others in order to feel more powerful. They also feed off the approbation and admiration that their supporters give them. People who bully others feel weak, inferior and inadequate, so they bully others to prove their strength, superiority and power....Ask Grace.com
Interestingly enough I found the above definition of a bully on a psychic website; Ask Grace.com. I'm not in the habit of visiting such sites, but Grace offered the best definition of Barack Hussein Obama and Harry Reid I came across while researching bullies.