'unrelatedness' originates from the prefix 'un-' meaning 'not' and the word 'related,' which comes from Latin 'relatus,' the past participle of 'referre,' meaning 'to bring back.'

'related' changed from the Latin word 'relatus' and eventually became the modern English word 'related.' The prefix 'un-' was added to form 'unrelated,' and the suffix '-ness' was added to form 'unrelatedness.'

Initially, 'related' meant 'brought back or connected,' but over time, 'unrelatedness' evolved to mean 'the state of not being connected.'