'discreditable' originates from the Latin word 'discreditare,' where 'dis-' meant 'apart' and 'creditare' meant 'to trust.'

'discreditare' transformed into the French word 'discréditer,' and eventually became the modern English word 'discreditable' through Middle English.

Initially, it meant 'to lose trust or reputation,' but over time it evolved into its current meaning of 'tending to bring harm to a reputation.'