'unshared' originates from the prefix 'un-' meaning 'not' and the word 'shared' from Old English 'scearu,' meaning 'division' or 'portion.'

'unshared' evolved from the combination of 'un-' and 'shared,' maintaining its meaning of exclusivity.

Initially, it meant 'not divided or portioned out,' and this meaning has largely remained the same in modern usage.