'unrecognizability' originates from English, specifically formed from the prefix 'un-' and the noun 'recognizability', where 'un-' meant 'not' and 'recognizability' derived from 'recognize' meaning 'to know again'.

'recognize' comes from Latin 'recognoscere' (re- 'again' + gnoscere 'to know'), passed into Old French and Middle English as forms such as 'reconnissen'/'recognisen', and developed into modern English 'recognize' and then the derived noun 'recognizability' and prefixed form 'unrecognizability'.

Initially, the root meant 'to know again' or 'to recall knowledge'; over time it evolved into the modern sense of 'to identify or acknowledge', and 'unrecognizability' now means 'the state of not being identifiable or recognizable'.