'irregularly-moving' originates from the combination of 'irregularly' and 'moving'. 'Irregularly' comes from the Latin 'irregularis', where 'in-' meant 'not' and 'regularis' meant 'rule'. 'Moving' comes from the Latin 'movere', meaning 'to move'.

'Irregularly' changed from the Latin 'irregularis' to the Old French 'irregulier', and eventually became the modern English word 'irregularly'. 'Moving' evolved from the Latin 'movere' to the Old French 'movoir', and eventually became the modern English word 'move'.

Initially, 'irregularly' meant 'not following a rule', and 'moving' meant 'to change position'. Over time, 'irregularly-moving' evolved to describe something that moves in an unpredictable manner.