'blamelessness' originates from the Old English word 'blama,' meaning 'blame,' combined with the suffix '-less,' indicating 'without,' and '-ness,' forming a noun indicating a state or quality.

'blama' transformed into the Middle English word 'blame,' and eventually became the modern English word 'blame.' The suffix '-less' was added to form 'blameless,' and '-ness' was appended to create 'blamelessness.'

Initially, it meant 'without blame,' and this meaning has largely remained the same in modern usage.