IPA: /ˈɡloʊtɪŋli/
KK: /ˈɡloʊtɪŋli/
In a way that shows great pleasure or satisfaction about one's own success or someone else's misfortune.
He smiled gloatingly after winning the competition while his opponent looked disappointed.
Gloatingly → It is formed from "gloat" (from Middle English *gloten*, meaning to look or stare with great delight) and the suffix "-ingly" (meaning in a manner of). The word "gloatingly" means in a manner that shows great delight or satisfaction, often at someone else's misfortune.
Think of someone who is 'staring with delight' at another's misfortune — that's what gloatingly means, showing joy in a way that is almost boastful.