oleaginous
adjective formal uk/ˌəʊ.liˈædʒ.ɪ.nəs/ us/ˌoʊ.liˈædʒ.ə.nəs/
甜言蜜语的;油嘴滑舌的;花言巧语的
extremely polite, kind, or helpful in a false way that is intended to bring some advantage to yourself
Synonyms: fulsome oily (TOO FRIENDLY)smarmy unctuous