An interesting question. I suppose it's all in context. Where are you doing the staring? If he's staring into your eyes from 40 feet away and doesn't react to your smile it's probably because he's not actually looking at you at all, but he's thinking about important things, like why does there have to be an end to football season or how can he afford the payments on a new BMW. If he's staring into them from 12 inches away in a restaurant and he doesn't react to you, it could be because he's mildly retarded. I'm afraid the only way you are going to know what he's thinking is to ask him. I know women always think they know exactly what a guy is thinking at any given moment of any given day, but believe me, it ain't true. If he's close enough to be really staring into your eyes, he's close enough to ask. Phil. He might be shy, but he also might not really be thinking about you. (guys aren't always very observant, I'm a guy, and even I will admit that).
Keep smiling :)
People are not interested because either your not their type, they are already in a relationship, or their gay.
He's either not interested or is to embarrassed.
If he doesn't seem interested he is either not interested in you or he does not want a relationship at this time.
either he is completely in love with you and has no idea he is staring at you, or you have very beautiful eyes that put him in a trance. either way for you is good
Then he is, but he's either afraid to be in a relationship or he just is staying off the market.
it either means he isn't interested in you, doesnt want to hang around you, or is getting over the breakup
Either you have something on your face or , yes, he likes you.
Either she likes you, or your staring has embarrassed her. Many people smile when they are embarrassed but have nto done anything themselves to cause the embarrassment. You mention "she ends up smiling" - that implies a considerable time has elapsed. Staring at someone for a considerable time can be unsettling for them.
It means the guys is either not interested or he's not ready to go that far yet, give him some time
that means he like u
get a friend that he knows to introduce u and if hes interested he will talk to u if not hes either scared or doesnt like u
She is either shy or sending a signal that she is not interested in you.--------------------------------------------------------------------------------------------------------------------The top answer is right but it needs to be put into more detail .. if she looks away she is either shy or she likes you but is embarrassed if however she looks away as in she she is disgusted / dislikes you then she obviously has no romantic / friendly feelings for you