oleaginous

From French oléagineux, from Latin oleāginus (“pertaining to olives or olive trees”), from olea (“the olive fruit and tree”).

• (UK) IPA^(key): /ˌəʊ.lɪˈædʒ.ɪ.nəs/
• (US) IPA^(key): /ˌoʊ.liˈædʒ.ɪ.nəs/

• Audio (US)

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oleaginous (comparative more oleaginous, superlative most oleaginous)

1. Oily, greasy.
2. (of manner or speech) Falsely or affectedly earnest; persuasively suave.

   The oleaginous salesman convinced me to buy a more expensive car.

   • 2018 May 9, George F. Will, “Trump is no longer the worst person in government”, in The Washington Post‎:

     The oleaginous Mike Pence, with his talent for toadyism and appetite for obsequiousness, could, Trump knew, become America’s most repulsive public figure.

• (oily, greasy): greasy, oily, sebaceous, unctuous
• (falsely or affectedly earnest): fulsome, smarmy, unctuous