IPA: /ˈfʊlsəmi/
KK: /ˈfʊlsəmlɪ/
In a way that is excessive or overly flattering, often to the point of being insincere or untrustworthy.
He praised her fulsomely, making it hard to believe his compliments were genuine.
Fulsomely → It is formed from "fulsome" (from Old English *fulsum*, meaning abundant or full) and the adverbial suffix "-ly" (meaning in a manner of). The word "fulsomely" means in a manner that is excessively flattering or abundant, often to the point of being insincere.
Think of 'fulsome' meaning abundant or excessive, and remember that 'fulsomely' describes doing something in an excessively flattering way.