Hmmm... i'll rephrase the question. How would i want to be
rejected by someone i am wooing?
Well, I don't want to be rejected. When someone is wooing u, they
will be oblivious to rejections. Even when u've rejected them
outright, they will never give up. They will continue loving u
until they got knock in the head by a big hammer or when someone
better comes along. Sounds like nonsense? But it's true.
Perhaps, this guy is perfect for u. Have u tried going out with him
before? Maybe he has a wonderful character waiting for u to
discover.
Then again, maybe he's a Total A$$. In which case, u can -
(1) Tell him that it's not going to happen. (2) Say that you're
married or already attached (i don't recommend lying unless u can
lie without batting an eyelid and/or if your conscience doesn't
bother u).
(3) Make him disgusted with u.
(4) Treat him worse than dirt. (again, i won't want to be treated
like dirt. Some guys are natural masochist, they like to be
hurt.)
(5) Disappear from his life, go overseas for studies, change job,
change hp no., change address, change your looks, etc etc...
Of these, i recommend (1) and (5). But try to remain as friends
unless he's doesn't make the grade to be your friend.
Good luck rejecting him. 
