'disregard' originates from the prefix 'dis-' meaning 'not' and the word 'regard' from Old French 'regarder', meaning 'to look at'.

'regarder' transformed into the Middle English word 'regarden', and eventually became the modern English word 'regard'.

Initially, it meant 'to look at or consider', but over time it evolved into its current meaning of 'to ignore or pay no attention to'.