A man that thinks he is nice, but is actually invasive even though, the girl doesn't date him.

See Virgin

Nice Guys (TM) are the guys that make a point of announcing themselves as "nice", and who whine about never getting laid.

Many of the other definitions were written by "Nice Guys".

They're not.

They think they're entitled to sex just because they hold open a door once in a while. They're unsure of themselves to the point they can't manage a declarative sentence. They think strumming guitar makes them deep and they can't understand why it hasn't turned them into a pussy magnet. They are, almost without fail, sexist but tell themselves they're not because, of course, they're a Nice Guy. They tell themselves "nice guys don't get ahead" as an excuse for their own failings. They wrongly believe that women only like jerks, and are deeply bitter about it.

Most women do not like jerks. Women really do like nice guys. But a nice guy is NOT the dude playing gentleman so he can be rewarded with head. The real nice guys -the ones women really do want to date and fuck -are the ones who are genuinely decent human beings. Guys who make a point of calling themselves Nice Guys do not generally fall under this category. And they wonder why they aren't getting any ladies?

So, you fucking internet whiners, how about instead of pissing and moaning about how women never see what a great fella you are and take your pants off all because you took them shopping (you charmer, you!) you actually put some effort into being a real, live nice person instead of a Nice Guy (TM) ?

A Nice Guy is a guy who is friendly, kind, and understanding toward girls with the underlying condition that they must fall in love with him because he is the only friendly, kind and understanding man they've ever met. Nice Guys think that acting like a decent person makes them special and entitled to women's romantic affections and sex.

They believe that women have no minds or emotions of their own, and that they exist solely to reciprocate the affection of whichever man 'deserves' them. They will often try to guilt women into going out with and having sex with them.

If and when a woman rejects a Nice Guy, he will whine and moan and complain that girls are stupid and don't know what's good for them, and only like jerks that won't respect them or their feelings. Nice Guys invariably fail to see the irony in this.

Not to be confused with an actual nice guy (no capital letters!), a guy who is kind and decent without the underlying expectation that women are obligated to sleep with him or return whatever romantic affections he might have toward them.

the hardest to find, but greatest to have

A nice guy who is someone who will repeatedly tell the girl of his wanting that is is kind and respectful of her feelings. In reality he is the opposite. He is only doing this to get you defences down. Nice guy will repeatedly try to get into your pants, or throw a fit if you don't do what he wants. If you were to ever call him out on his immature behavior he would look shocked and say "I'm a nice guy I wouldn't do that." I nice guy doesn't want to be your friend, he doesn't want anything other then for you to be his girlfriend so he wouldn't have to feel bad about himself. Most NICE GUYS are selfish creepy jerks, who don't know what I just want to be friends, mean.
Remember Guys: Nice guys don't need to remind people that they are nice and respectful. Telling people that your a nice guy is pretty much like someone saying no offence but....

a young man who is selfless, caring and rejects dominance and machismo