1. To depart from; leave: "You and I are on the point of quitting the theater of our exploits" (Horatio Nelson).
2. To leave the company of: had to quit the gathering in order to be home by midnight.
3. To give up; relinquish: quit a job.
4. To abandon or put aside; forsake: advised them to quit their dissipated ways.
5. To cease or discontinue: asked them to quit talking; quit smoking.
6. Computer Science To exit (an application).
Now, quitting as easy as it sounds is difficult to say the least. Now depending on what you are quitting should dictated the level of difficulty.