As adjectives the difference between unprincipled and knavish
is that unprincipled is lacking moral values while knavish is having the characteristics of a knave; mischievous, roguish, waggish, rascally or impertinent.
unprincipled
English
Synonyms
*licentious, immoral
Related terms
*principled
*principle
References
*Oxford English Dictionary
knavish
English
Adjective
(
en adjective)
Having the characteristics of a knave; mischievous, roguish, waggish, rascally or impertinent