'unveined' originates from the prefix 'un-' meaning 'not' and the word 'veined', which comes from the Latin word 'vena' meaning 'vein'.

'veined' changed from the Latin word 'vena' and eventually became the modern English word 'veined'.

Initially, it meant 'having veins', but with the prefix 'un-', it evolved into its current meaning of 'lacking veins'.