- The definition of unscrupulous is someone or something that is dishonest or immoral.
An example of unscrupulous behavior is when you copy someone's work behind his back and then take credit for it.
not scrupulous; not restrained by ideas of right and wrong; unprincipled
Having or showing no regard for what is right or honorable; devoid of scruples.
(comparative more unscrupulous, superlative most unscrupulous)