Having scruples; having or showing a strict regard for what one considers right; principled.
If we aren't careful and scrupulous in considering which entries we allow on Urbandictionary.com we may end up with some definition about two monkeys screwing where it shouldn't be.
Someone who has a conscience, cares about the consequences of their actions, someone who has morals and tries to live by them. You have scrupples because you dont burn people to get ahead. You strive to do good and if you do something wrong you realize it and feel bad about it.
The owner of a company surely doesnt have scrupples when he gets a fat raise and doesnt even give his workers a cost of living raise...booerns.