A nice guy is either one of two types:

The first being a guy who is genuinely kind and caring. He is polite to everyone regardless of sex, age or race. He has no ulterior motive, i.e. he is not nice to get a reward, he behaves as such because it's human decency.

The second kind of nice guy is the one who has ulterior motives. He believes that because he behaves in a certain way the world owes him for his actions. He doesn't make it clear what he desires from the beginning and becomes angry when he doesn't get what he wants.

A real nice guy is a guy who is just NICE. Kind, caring and understanding but without expecting a reward for it.

A self declared nice guy however is usually a guy who will be nice to you and expect some sort of romantic or sexual reward.

The self declared nice guys usually are the ones who complain about being friendzoned.

(Noun, adjective.), A human male whom treats women as property and status and assumes just because they're kind to them, they're entitled to their bodies and assets. They often times appeal as a kind and compassionate man at the beginning of a relationship, but slowly become more controlling and demeaning towards his partner as the relationship progresses.

Similar to an incel, in the sense that they feel women owe them sex due to them being “nice” to them, but in reality are unbelievably terrible people who live on the borderline of sex offenders and stalkers based on how many of them treat women. A nice guy tends to come on too strong, ask creepy personal questions and then go apeshit when a woman denies them sex, a date, or says they’re seeing someone else and not see the hypocrisy of them calling themselves a “nice guy”.

1. A manipulative male that forms friendships with females under the false pretense that it won't be a sexual relationship. All the while actually lusting after the female. He is then generally confused as to why the female goes after males that are open about their desires, and blames the female when it is his own fault for creating a friendship when he really wanted to date her.

2. The guy that's always there for his friends.

The guy who will listen to a womans problems, support her through hard times and help her do anything she needs help with. The guy who will break his back just to make somebody happy. That's a nice guy.

And a REAL nice guy doesn't give a shit if he gets to go out with women or have sex with them, he's there for them because he wants to try and make them happy. One who expects to be rewarded sexually is no more then another fool.

A heterosexual male who has been rejected countless times by the opposite gender for his lame-ass attempts to woo them. A nice guy usually expect complementary sex for something the average person would do.

The "nice guy" will pretend to be "nice" up until his rejection from his target and he will reveal his true nature as a misogynistic, inept piece of shit and referring to himself as being "friend-zoned".
Stay away from these type of people at all costs or just piss at them fucking piss at them.

A badge of martyrdom. Men who spend their most of their time whining about how women “just want to date jerks”. Oblivious to the fact that no one finds people who feel sorry for themselves attractive, much less people who blame others for their lack of success. Most self proclaimed “nice guys” are just as self-centered and misogynistic as the jerks they gripe about, they are just much more spineless. To stupid to figure why women don’t find them attractive, they conclude that in order to get laid they must treat a woman like shit.

They tend to befriend women with the expectation that women owe them something more than friendship, then get all pissed off when the women tells them she’s not interested. Often going after women who are already in relationships, they misrepresent their intentions and try to use emotional manipulation and the facade of friendship as an excuse to get closer to them and score with them.

The sort of man who will give my definition a thumbs down. :)

A misnomer. Nice Guy is nice with an ulterior motive; he believes pretending to be a decent human being entitles him to endless sex with his unfortunate female target. Instead of openly expressing interest and then moving on if rejected, the Nice Guy prefers to attach himself like a barnacle to one woman, hoping that if he pretends to care about her feelings long enough, he'll get at least an awkward handjob in the bathroom. Nice Guy is then bewildered when acting like a friend results in his getting treated like a friend. The advanced-level Nice Guy will call his lady of choice a frigid bitch while simultaneously patting himself on the back for being so nice. Nice Guy fails to understand that acting nice in hopes of getting sex is not actually the same as being nice, and as a result can be found in his natural habitat martyring himself all over the internet.