'irregularly-changed' originates from the combination of 'irregularly' and 'changed', where 'irregularly' is derived from Latin 'irregularis', meaning 'not regular', and 'changed' from Old French 'changier', meaning 'to alter'.

'irregularis' transformed into the Old French 'irregulier', and eventually became the modern English word 'irregularly'. 'Changier' transformed into the Middle English 'chaungen', and eventually became the modern English word 'changed'.

Initially, 'irregularly' meant 'not following a regular pattern', and 'changed' meant 'altered'. The combined term 'irregularly-changed' retains these meanings in modern usage.