'irregularly-developed' originates from the combination of 'irregularly' and 'developed'. 'Irregularly' comes from Latin 'irregularis', where 'in-' meant 'not' and 'regularis' meant 'rule'. 'Developed' comes from Old French 'desveloper', where 'des-' meant 'un-' and 'veloper' meant 'wrap'.

'Irregularly' changed from the Latin 'irregularis' to the Old French 'irregulier', and eventually became the modern English word 'irregularly'. 'Developed' transformed from the Old French 'desveloper' to the modern English 'developed'.

Initially, 'irregularly' meant 'not following a rule', and 'developed' meant 'unwrapped or unfolded'. Over time, 'irregularly-developed' evolved to mean 'not developed in a regular manner'.