'inexhaustible' originates from Latin, specifically the word 'inexhaustibilis,' where 'in-' meant 'not' and 'exhaustibilis' meant 'capable of being exhausted.'

'inexhaustibilis' transformed into the French word 'inexhaustible,' and eventually became the modern English word 'inexhaustible' through Middle English.

Initially, it meant 'not capable of being exhausted,' and this meaning has largely remained the same in modern usage.