UNSCRUPULOUS
unscrupulous
(adjective) without scruples or principles; “unscrupulous politicos who would be happy to sell...their country in order to gain power”
Source: WordNet® 3.1
Etymology
Adjective
unscrupulous (comparative more unscrupulous, superlative most unscrupulous)
Without scruples; immoral.
Contemptuous of what is right or honorable.
Antonyms
• scrupulous
• ethical
• upstanding
Source: Wiktionary
Un*scru"pu*lous, a.
Definition: Not scrupulous; unprincipled.
– Un*scru"pu*lous*ly, adv.
– Un*scru"pu*lous*ness, n.
Source: Webster’s Unabridged Dictionary 1913 Edition