'disjointed' originates from Middle English, specifically the word 'disjointen,' where 'dis-' meant 'apart' and 'joint' meant 'join or connect.'

'disjointen' transformed into the modern English word 'disjointed,' and eventually led to the noun form 'disjointedness.'

Initially, it meant 'to separate or disconnect,' but over time it evolved into its current meaning of 'lacking coherence or unity.'