Wiktionary
placative
a. (context chiefly US English) That placates; pacifying.
WordNet
Usage examples of "placative".
Vill TEMPLE ENTERED THE DINING-ROOM FROM THE KITCHEN, HER face fixed in a cringing, placative expression.
She looked at Temple across SANCTUARY 53 her shoulder while Temple stared at her with that grimace of cringing and placative assurance.