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Adjective: oleaginous  ,ow-lee'a-ju-nus
  1. Unpleasantly and excessively suave or ingratiating in manner or speech
    "oleaginous hypocrisy";
    - buttery, fulsome, oily, smarmy, soapy, unctuous
     
  2. Containing an unusual amount of grease or oil
    "oleaginous seeds";
    - greasy, oily, sebaceous

See also: fat, fatty, insincere