'abashlessly' originates from the English word 'abashless', where 'abash' meant 'to destroy the self-confidence of' and the suffix '-less' indicates 'without'.

'abashless' changed from the Old French word 'esbahir', which meant 'to be astonished', and eventually became the modern English word 'abash'.

Initially, it meant 'without being astonished or embarrassed', but over time it evolved into its current meaning of 'without embarrassment or shame'.