Impune means something that goes unchallenged or unpunished. There are several synonyms for the word impune, including clear, unscathed, unharmed, and untouched. Other possibilities include harmless, blameless, innocent, and faultless. These words all describe a situation where one has come away without consequence, whether from a specific accusation or from a general situation. While they all capture the essence of impune, each word has its own nuances and shades of meaning that make it unique. With the right synonym, you can capture exactly the shade of meaning you are looking for when describing a situation where someone has gone unpunished or unchallenged.