unctuous

Excessively flattering or ingratiating in a way that feels insincere; oily in manner.

• unctuously/ˈʌŋktʃuəsli/(adv)油腔滑调地
• unctuousness/ˈʌŋktʃuəsnəs/(n)油滑

• unctuous smile
• unctuous praise
• unctuous manner
• unctuous politician

1. 1.The unctuous salesman complimented everything from her taste to her intelligence. (oily flattery)
2. 2.His unctuous tone during the eulogy made it clear he barely knew the deceased. (insincere smoothness)

• sycophantic/ˌsɪkəˈfæntɪk/— fawning to gain advantage
• oleaginous/ˌoʊliˈædʒɪnəs/— oily, literally and figuratively
• fulsome/ˈfʊlsəm/— excessive and insincere

from Latin "unctus" (anointed) — from "unguere" (to anoint with oil) — literally "oily"