'abirritate' originates from Latin, specifically the word 'abirritare,' where 'ab-' meant 'away from' and 'irritare' meant 'to irritate.'

'abirritare' transformed into the English word 'abirritate,' and eventually became the adjective 'abirritated.'

Initially, it meant 'to remove irritation,' and this meaning has largely remained the same in modern usage.