To be slick, cunning, and glib, often implying untrustworthiness or superficiality.
他说话总是油头滑脸的，让人很难相信他的真心。
He always speaks in a slick and evasive manner, making it hard for people to believe his sincerity.
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To be slick, cunning, and glib, often implying untrustworthiness or superficiality.