'irregularly-modified' originates from the combination of 'irregularly' and 'modified'. 'Irregularly' comes from Latin 'irregularis', where 'in-' meant 'not' and 'regularis' meant 'according to rule'. 'Modified' comes from Latin 'modificare', where 'modus' meant 'measure' and 'facere' meant 'to make'.

'Irregularis' transformed into the Old French word 'irregulier', and eventually became the modern English word 'irregular'. 'Modificare' transformed into the Old French word 'modifier', and eventually became the modern English word 'modify'.

Initially, 'irregularly' meant 'not according to rule', and 'modified' meant 'to make a measure'. Over time, 'irregularly-modified' evolved to mean 'changed in a manner that does not follow a regular pattern'.