unctuous

这块蛋糕有种油腻的质地，让人感觉不舒服。

The cake has an ___unctuous texture that feels unpleasant.

他虚情假意的奉承让房间里所有人都感到不适。

His ___unctuous flattery made everyone in the room uncomfortable.

那位汽车销售用谄媚的笑容和握得过久的手迎接我们。

The car salesman greeted us with an ___unctuous smile and a handshake that lingered a moment too long.