'unfriendliness' originates from Old English, specifically the word 'unfrēondlīcnes,' where 'un-' meant 'not' and 'frēondlīc' meant 'friendly.'

'unfrēondlīcnes' transformed into the Middle English word 'unfrendlynesse,' and eventually became the modern English word 'unfriendliness.'

Initially, it meant 'the state of not being friendly,' and this meaning has largely remained the same in modern usage.