IPA: /ˈbleɪmləsli/
KK: /ˈbleɪmləsli/
In a way that does not deserve blame or criticism; without fault.
She handled the situation blamelessly, ensuring that no one was at fault.
Blamelessly → It is formed from "blame" (from Old English "blæm", meaning to accuse or censure) and "-less" (meaning without) and "-ly" (meaning in a manner). The word "blamelessly" means in a manner that is without blame or accusation.
Think of being 'without' ('-less') 'accusation' ('blame') — that's why blamelessly means acting in a way that does not attract blame.