How did BP become an unprincipled bottom-line operator ready to cut any corners for profit?
In politics, impractical positions count as inherently … unprincipled.
Refusing to do so on the basis of ethnic solidarity is an unprincipled copout.
1630s, "not instructed" (in something), from un- (1) "not" + principled. Meaning "not honorable" is recorded from 1640s.