soft-soaper

[sawft-soh-per, soft-]
noun Informal.
  1. 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
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018