Shades of grey means not everyting is black and white (ie: right or wrong) It means things can be interpreted one way or another. To say a husband is a bad husband because he works all the time and is never home would be black and white... to look into WHY the guy works all the time you'll find out he's working to provide a luxurious life for his wife and kids... see? Not wrong, but not right either = grey.