oleaginous

他奉承领导的言辞油滑得让人作呕。

His ___oleaginous praise of the boss made everyone cringe.

这块蛋糕表面覆盖着一层油亮的糖霜，在灯光下闪闪发光。

The cake was covered with an ___oleaginous frosting that shimmered under the light.