'erratically-updated' originates from the combination of 'erratic' and 'update'. 'Erratic' comes from Latin 'erraticus', meaning 'wandering', and 'update' is derived from 'up' and 'date', meaning 'to bring up to date'.

'Erraticus' transformed into the Old French 'erratique', and eventually became the modern English word 'erratic'. 'Update' was formed in modern English by combining 'up' and 'date'.

Initially, 'erratic' meant 'wandering', but over time it evolved into its current meaning of 'irregular or unpredictable'. 'Update' has largely retained its original meaning of 'bringing something up to date'.