The word "un-principled" refers to someone or something that lacks moral principles or scruples. Antonyms for this word include "principled," "moral," "ethical," "upright," and "virtuous." A principled person is someone who adheres to their beliefs and values, even in difficult situations. A moral person has a strong sense of right and wrong and behaves accordingly. An ethical person conducts themselves in an honest and fair manner. An upright person follows the rules and behaves according to high standards. A virtuous person displays moral excellence and behaves in a way that is beneficial to others. All of these words are antonyms for "un-principled" and describe positive character traits.