'unsurvivable' originates from the prefix 'un-' meaning 'not' and the word 'survivable', which comes from 'survive', derived from Latin 'supervivere', where 'super-' meant 'over' and 'vivere' meant 'to live'.

'survivable' changed from the Latin word 'supervivere' and eventually became the modern English word 'survive', with 'unsurvivable' forming as a negation.

Initially, 'survive' meant 'to live beyond', but 'unsurvivable' evolved to mean 'impossible to survive'.