- lacking or not based on moral scruples or principles: an unprincipled person; unprincipled behavior.
- not instructed in the principles of something (usually followed by in).
Origin of unprincipled
SynonymsSee more synonyms on Thesaurus.com
1. tricky, dishonest. See unscrupulous.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for unprincipled
Refusing to do so on the basis of ethnic solidarity is an unprincipled copout.Three Cheers for a Settlement Boycott
March 21, 2012
In politics, impractical positions count as inherently … unprincipled.Stop Rewriting Thanksgiving—and the Rest of History
November 25, 2011
How did BP become an unprincipled bottom-line operator ready to cut any corners for profit?Why Is BP's Former Boss a U.K. Hero?
June 10, 2010
Anything more high-minded than an unprincipled grab for power voters might consider a sham.Our Gutless Turn-Tail Politics
January 9, 2010
He changed the note once more with an unprincipled versatility.The Secret Agent
There will be left of it but one unprincipled woman—and she wretched and an outcast.Ruggles of Red Gap
Harry Leon Wilson
In this matter, however, Lloyd Avalons was not quite so unprincipled as he seemed.The Dominant Strain
Anna Chapin Ray
He was a bold, undaunted, and energetic seaman, but unprincipled and merciless.Queen Elizabeth
Unprincipled attacks are often made on me by political muckrakers.
- lacking moral principles; unscrupulous
- (foll by in) archaic not versed in the principles of (a subject)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Word Origin and History for unprincipled
Online Etymology Dictionary, © 2010 Douglas Harper