lacking principles or moral scruples; "freedom from coarse unprincipled calumny"- A E Stevenson
having little or no integrity lacking principles or moral scruples; "freedom from coarse unprincipled calumny"- A
disapproval If you describe a person or their actions as unprincipled, you are criticizing them for their lack of moral principles and because they do things which are immoral or dishonest. It is a market where people can be very unprincipled and unpleasant. the unprincipled behaviour of the prosecutor's office during the crisis. = unscrupulous principled. not caring whether what you do is morally right = unscrupulous