'improvably' originates from the English word 'improvable', which is derived from the Latin word 'improbare', where 'im-' meant 'not' and 'probare' meant 'to test or prove'.

'improbare' transformed into the Old French word 'improver', and eventually became the modern English word 'improvable', leading to the adverb form 'improvably'.

Initially, it meant 'capable of being improved', and this meaning has largely remained the same in modern usage.