shady, sketchy, dodgy, detestable, unethical.
Having a slippery surface; having a surface covered with grease.
Afflicted with the disease called grease.
Containing a lot of grease or fat.
Any of a class of mucin-like substances yielding on decomposition a reducing carbohydrate together with some form of proteinaceous matter.
Pertaining to or resembling mucus; mucous.