'unorganized' originates from the prefix 'un-' meaning 'not' and the word 'organized' from the Latin 'organizare', meaning 'to arrange'.

'unorganized' changed from the Old French word 'organiser' and eventually became the modern English word 'organized', with 'un-' added to denote the opposite.

Initially, it meant 'not arranged', and this meaning has largely remained the same in modern usage.