The Collaborative International Dictionary of English v.0.48:

Oleaginousness \O`le*ag`i*nous*ness\, n.
   Oiliness. --Boyle.
   [1913 Webster]

WordNet (r) 3.0 (2006):

oleaginousness
    n 1: consisting of or covered with oil [syn: greasiness,
         oiliness, oleaginousness]
    2: smug self-serving earnestness [syn: fulsomeness,
       oiliness, oleaginousness, smarminess, unctuousness,
       unction]