IPA: /ˈɡɪltləsli/
KK: /ˈɡɪltləsli/
In a way that shows no guilt or wrongdoing; acting without feeling guilty.
She guiltlessly accepted the award, knowing she had done nothing wrong.
Guiltlessly → It is formed from "guilt" (from Old English "gylt", meaning a crime or sin) and the suffix "-less" (meaning without) and the adverbial suffix "-ly" (meaning in a manner). The word "guiltlessly" means in a manner that is without guilt or sin.
Think of being 'without' ('-less') a 'crime' or 'sin' ('guilt') — that's why guiltlessly means acting without guilt.