oleaginous

from WordNet (r) 3.0 (2006)

oleaginous
    adj 1: unpleasantly and excessively suave or ingratiating in
           manner or speech; "buttery praise"; "gave him a fulsome
           introduction"; "an oily sycophantic press agent";
           "oleaginous hypocrisy"; "smarmy self-importance"; "the
           unctuous Uriah Heep"; "soapy compliments" [syn:
           {buttery}, {fulsome}, {oily}, {oleaginous}, {smarmy},
           {soapy}, {unctuous}]
    2: containing an unusual amount of grease or oil; "greasy
       hamburgers"; "oily fried potatoes"; "oleaginous seeds" [syn:
       {greasy}, {oily}, {sebaceous}, {oleaginous}]

from The Collaborative International Dictionary of English v.0.48

Oleaginous \O`le*ag`i*nous\, a. [L. oleaginus, oleagineus,
   belonging to the olive, fr. olea olive: cf. F. ol['e]agineux.
   See {Olive}, {Oil}.]
   Having the nature or qualities of oil; oily; unctuous.
   [1913 Webster]

from The Devil's Dictionary (1881-1906)

OLEAGINOUS, adj.  Oily, smooth, sleek.
    Disraeli once described the manner of Bishop Wilberforce as
"unctuous, oleaginous, saponaceous."  And the good prelate was ever
afterward known as Soapy Sam.  For every man there is something in the
vocabulary that would stick to him like a second skin.  His enemies
have only to find it.