C2 adjective /ɪnˈɡreɪʃiˌeɪtɪŋ/
ingratiating
お世辞を言う
Meaning
Charming or flattering in a way intended to gain favor.
Example
His ingratiating smile made everyone trust him quickly.
彼のお世辞を言う笑顔は、すべての人々に彼を素早く信頼させた。