Meanings of unctuous tones in английском

Canadian Shakespearean actor Douglas Rain won the role with neutral, unctuous tones.

A man, lost in the multitude, was mouthing words in the monotonous, unctuous tones of a prayer.

The attendant, a bullet-headed fellow with Scandinavian cheek-bones, leaned down, looking flagrantly solicitous, and inquired in unctuous tones if there was "anything else at present."

"Go no farther," said Boniface Cointet in unctuous tones; "it would not be right.

"Well, is your work finished?" asked the old man, in the unctuous tones peculiar to men of the ancient aristocracy.