unscrupulous

un- +‎ scrupulous

• IPA^(key): /ˌʌnˈskɹuːpjʊləs/
• Hyphenation: un‧scru‧pu‧lous

unscrupulous (comparative more unscrupulous, superlative most unscrupulous)

1. Without scruples; immoral.
   • 1888, Rutherford B. Hayes, Charles Richard Williams, editor, Diary and Letters of Rutherford Birchard Hayes, volume IV, Ohio State Archæological and Historical Society, published 1925, page 374:

     The real difficulty is with the vast wealth and power in the hands of the few and the unscrupulous who represent or control capital.

2. Contemptuous of what is right or honorable.

• scrupulous
• ethical
• upstanding