'irregularly-arranged' originates from the combination of 'irregular' and 'arranged'. 'Irregular' comes from Latin 'irregularis', where 'in-' meant 'not' and 'regularis' meant 'rule'. 'Arrange' comes from Old French 'arangier', where 'a-' meant 'to' and 'rangier' meant 'set in a row'.

'Irregular' changed from the Latin word 'irregularis' and 'arrange' from the Old French word 'arangier', eventually forming the modern English term 'irregularly-arranged'.

Initially, 'irregular' meant 'not following a rule', and 'arrange' meant 'to set in a row'. Over time, 'irregularly-arranged' evolved to mean 'not organized in a regular way'.