'unintentionally-given' originates from the combination of 'unintentionally' and 'given'. 'Unintentionally' comes from 'un-' meaning 'not' and 'intentionally' meaning 'done with intention'. 'Given' is the past participle of 'give', which originates from Old English 'giefan'.

'Unintentionally' evolved from Middle English 'unintencionel', and 'given' from Old English 'giefan', eventually forming the modern English term 'unintentionally-given'.

Initially, 'unintentionally' meant 'not done on purpose', and 'given' meant 'bestowed or granted'. Together, they convey the idea of something bestowed without intention.