'otherworldly' originates from the combination of 'other' and 'worldly', where 'other' meant 'different' and 'worldly' referred to 'pertaining to the world'.

'otherworldly' evolved from the Old English word 'oþer' and 'woruldlic', eventually becoming the modern English word 'otherworldly'.

Initially, it meant 'pertaining to another world', and this meaning has largely remained the same in modern usage.