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unprincipled

[uhn-prin-suh-puh ld] /ʌnˈprɪn sə pəld/
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
1625-1635
1625-35; un-1 + principled
Related forms
unprincipledness, noun
Synonyms
1. tricky, dishonest. See unscrupulous.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for un principled

unprincipled

/ʌnˈprɪnsɪpəld/
adjective
1.
lacking moral principles; unscrupulous
2.
(foll by in) (archaic) not versed in the principles of (a subject)
Derived Forms
unprincipledness, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for un principled

unprincipled

adj.

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

Online Etymology Dictionary, © 2010 Douglas Harper
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2
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