'easy-going' originates from the combination of 'easy' and 'going', where 'easy' meant 'not difficult' and 'going' referred to 'movement or progress'.

'easy-going' evolved from the Middle English word 'easie' and 'going', eventually becoming the modern English word 'easy-going'.

Initially, it meant 'progressing without difficulty', but over time it evolved into its current meaning of 'relaxed and tolerant'.