口くち先さきのうまい

i-adjective

smooth-talking; glib; honey-tongued

Describes someone who speaks flatteringly or persuasively, often with a negative connotation of insincerity.

• 彼かれは口くち先さきのうまい人ひとだから、気きをつけたほうがいい。

  He's a smooth talker, so you'd better be careful.

• 口くち先さきのうまいセールスマンにだまされて、高たかいものを買かわされた。

  I was tricked by a glib salesman and ended up buying something expensive.