UNSAVORY
unsavory, unsavoury, offensive
(adjective) morally offensive; “an unsavory reputation”; “an unsavory scandal”
distasteful, unsavory, unsavoury
(adjective) not pleasing in odor or taste
Source: WordNet® 3.1
Etymology
Adjective
unsavory (comparative more unsavory, superlative most unsavory) (American spelling)
Not savory; without flavor.
Of bad taste; distasteful.
Making an activity undesirable.
Disreputable, not respectable, of questionable moral character.
Usage notes
• Nouns to which "unsavory" is often applied: reputation, character, aspect, element, practice, friend, tactics.
Source: Wiktionary