unprincipled

[uhn-prin-suh-puhld]
adjective
1.
lacking or not based on moral scruples or principles: an unprincipled person; unprincipled behavior.
2.
not instructed in the principles of something (usually followed by in ).

Origin:
1625–35; un-1 + principled

unprincipledness, noun


1. tricky, dishonest. See unscrupulous.
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World English Dictionary
unprincipled (ʌnˈprɪnsɪpəld)
 
adj
1.  lacking moral principles; unscrupulous
2.  archaic (foll by in) not versed in the principles of (a subject)
 
un'principledness
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

unprincipled
1634, "not instructed" (in something), from un- (1) "not" + principled (see principle). Meaning "not honorable" is recorded from 1644.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
They find, on all sides, bounds to their unprincipled ambition in any fixed
  order of things.
The facts change, positions change, nothing unprincipled about that.
There are too many people who are unethical and unprincipled for that to work.
Not only is that ruling absurd, but it is completely unprincipled.
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