'unconcernedly' originates from the English word 'unconcerned,' where 'un-' is a prefix meaning 'not,' and 'concerned' is derived from the Latin 'concernere,' meaning 'to sift together.'

'unconcerned' changed from the Middle English word 'concernen' and eventually became the modern English word 'unconcerned.'

Initially, it meant 'not involved or interested,' and this meaning has largely remained the same in modern usage.