'worry-free' originates from the combination of 'worry' and 'free', where 'worry' meant 'to feel anxious' and 'free' meant 'without'.

'worry' changed from Old English word 'wyrgan' and 'free' from Old English 'freo', eventually forming the modern English word 'worry-free'.

Initially, 'worry' meant 'to strangle' in Old English, but over time it evolved into its current meaning of 'to feel anxious'.