'incoherent' originates from Latin, specifically the word 'incohaerens,' where 'in-' meant 'not' and 'cohaerens' meant 'sticking together.'

'incohaerens' transformed into the French word 'incohérent,' and eventually became the modern English word 'incoherent' through Middle English.

Initially, it meant 'not sticking together,' but over time it evolved into its current meaning of 'lacking clarity or organization.'