Synonyms for Unaffected (same or very similar meaning)
WordNet sense 1 (unaware of or indifferent to):
insensibleWordNet sense 2 (emotionally unmoved):
unmovedWordNet sense 3 (free from artificiality):
naturalWordNet sense 4 (not influenced or affected):
uninfluenced, untouchedFrom the ODE community, based on WordNetadd/edit