'inure' originates from Middle English, specifically the word 'enure,' where 'en-' meant 'in' and 'ure' meant 'use.'

'enure' transformed into the modern English word 'inure' through the influence of legal and formal usage.

Initially, it meant 'to bring into use,' but over time it evolved into its current meaning of 'to accustom to something unpleasant.'