'sound-unaffected' originates from the combination of 'sound,' meaning 'in good condition,' and 'unaffected,' meaning 'not influenced or changed.'

The term 'sound-unaffected' combines the Old English 'sund' (sound) and the Middle English 'unafected' (unaffected), eventually forming the modern English term.

Initially, 'sound' meant 'healthy' or 'whole,' and 'unaffected' meant 'not influenced.' The combined term retains these meanings, indicating something that remains in good condition despite external factors.