'inopportune' originates from Latin, specifically the word 'inopportunus,' where 'in-' meant 'not' and 'opportunus' meant 'favorable or convenient.'

'inopportunus' transformed into the French word 'inopportun,' and eventually became the modern English word 'inopportune' through Middle English.

Initially, it meant 'not favorable or convenient,' and this meaning has largely remained the same in modern usage.