'lamentable' originates from Latin, specifically the word 'lamentabilis,' where 'lamentari' meant 'to lament.'

'lamentabilis' transformed into the Old French word 'lamentable,' and eventually became the modern English word 'lamentable' through Middle English.

Initially, it meant 'worthy of lamentation,' but over time it evolved into its current meaning of 'deserving to be criticized or regretted.'