IPA: /ɪnˈsʌltɪŋli/
KK: /ɪnˈsʌltɪŋli/
In a way that shows a lack of respect or is rude to someone.
He spoke to her insultingly, making her feel belittled.
Insultingly → It is formed from "insult" (from Latin "insultare", meaning to jump on or attack) and "-ingly" (a suffix used to form adverbs). The word "insultingly" means in a manner that attacks or offends someone.
Think of someone 'jumping on' ('insultare') another person in a verbal attack — that's why doing something insultingly means to offend someone.