A "principled man" refers to someone who strongly upholds their moral values and follows a code of ethics in their actions and decisions. They have a clear set of personal principles that guide their behavior and choices in life. Full definition
To answer the first inquiry a social order that principles men greater than women. (datingintimate.com)
Not only is it clear that in principle man can never predict the behavior of individual electrons, it is also clear that the reason for the success of his predictions when he deals with larger entities is that so many of the ultimate actual entities are involved. (religion-online.org)
7 % don't agree with either, 6 % agree with both (which is fair enough — one could be a decent and principled man with unworkable and dangerous views!). (ukpollingreport.co.uk)