Definition

(Adjective)

1: resembling or having the properties of oil : oily; also : containing or producing oil
2 : marked by an offensively ingratiating manner or quality
In Context
“Sometime around 2000, Sater got to know a neighbor, Tevfik Arif, an oleaginous former Soviet official from Kazakhstan.”
 Andrew Rice, Daily Intelligencer, “The Original Russia Connection,” 3 Aug. 2017