Lacking principles or moral scruples; unscrupulous: unprincipled behavior. (adjective)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "unprincipled" in a sentence
"He's in real danger of being defined as unprincipled, be it in how he campaigns or the fact he's turned himself into Bush III."
"He must be not only easy-going, but unprincipled, -- unprincipled, that is, rather in the sense of having no particular principles of any kind than in that of possessing and practising notoriously bad ones."
""These two top Tories are what my father - himself an Old Etonian - would have called unprincipled spivs," he said."