His flattery was dripping with such obvious unction that it made everyone uncomfortable.

unction 来自拉丁语 unguere（涂抹），原指宗教仪式中的"涂油礼"，引申为"油滑的言行"或"过分热情的奉承"。在句中比喻那种像油一样滑腻、不真诚的恭维态度。