soft-soaper

[ sawft-soh-per, soft- ]
/ ˈsɔftˈsoʊ pər, ˈsɒft- /

noun Informal.

a person who flatters or cajoles, especially for reasons of self-interest or personal advantage: a soft-soaper specializing in rich, elderly women.

Origin of soft-soaper

First recorded in 1850–55; soft-soap + -er1