Etymology
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unprincipled (adj.)

1630s, "not instructed" (in something), from un- (1) "not" + principled (adj.). Meaning "not honorable" is recorded from 1640s.

updated on February 28, 2014

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Definitions of unprincipled from WordNet

unprincipled (adj.)
lacking principles or moral scruples; "freedom from coarse unprincipled calumny"- A.E.Stevenson;
unprincipled (adj.)
having little or no integrity;
From wordnet.princeton.edu, not affiliated with etymonline.