if you don't plan on giving him more of a chance and getting to know him better then just being turned off from him after one mess up, then be blunt and honest with him, it is better to do it this way so he doesn't get attached, as a guy it is easier to appreciate a woman who can do this for you, let him know where he could improve

''hey just wanted to let you know, it was really awesome meeting you, I was really interested in you at first, but then It felt like you were awkward on our date and I got turned off, I'm sorry you were really sweet, but I'm not interested in dating you, I wish you the best of luck''

ooo that sounds harsh. i think you're right in that i should be direct. bleh don't want to

also, it wasn't just one mess up. if he was interesting or funny, I could overlook some awkwardness. i

Ok, I don't want to be mean, but if you really want to break it off with the guy DON'T be friendly, DON'T try to put him down gently. Just tell him straight out that you're not interested. It saves a lot of time and heartache for the guy if he's really into you.

If you just keep on being indirect he very well might be the persistent type who keeps on trying until he gets a "no". I know from experience if a girl doesn't give me a clear "no" I'll rationalize in my own head that I still have a chance (which I don't 90% of the time).

The world would be a much better place if we could be honest with each other, "I like you", "I don't like you" etc.... You're really not saving anyones feelings by being in-direct.

It's always felt fine once I am comfortable with the person, and in the past I'd always think it's easier for girls, knowing that guys don't reject as much.
I now know this isn't true.

I think be comfortable with him, and act yourself, but don't hesitate, be in charge and I think he'll love it.

It's this indirectness and confusing aspects of female behavior that lead a lot of guys to this forum.

Being direct is like negative reinforcement. It is harsh. But it's the best way for him to learn.

If you tell him straight out why it didn't work out between you two, he'll learn and adjust for the future. But if you are vague, and keep throwing out "You're sweet" and "You're such a nice guy", he will not understand what he did wrong, so as a result he will try to be "nicer" and "sweeter", which will make him more awkward, less true to himself, and less attractive.

If you really want to do this guy a favor, leave him with some parting advice. He may be disappointed things didn't work out with you, but at least he'll know why.

I am a thick skin dude but it still is a bit harsh for my taste. And awesome meeting you, but you were awkward sounds strange awesome + awkward

Yes, you need to be straight and honest, this would do:
"Hi it was nice meeting you, unfortunately I did not feel any chemistry (or connection) between us. "

"Hi,

I agree that sounds a bit cold and harsh.