'impermeable' originates from Latin, specifically the word 'impermeabilis,' where 'im-' meant 'not' and 'permeabilis' meant 'passable'.

'impermeabilis' transformed into the French word 'imperméable,' and eventually became the modern English word 'impermeable'.

Initially, it meant 'not passable by liquid,' and this meaning has largely remained the same in modern usage.