Synonyms for Disloyal (same or very similar meaning)
WordNet sense 1 (showing lack of love for your country):
unpatrioticWordNet sense 2 (in opposition to a civil authority or government):
subversiveWordNet sense 3 (having the character of, or characteristic of, a traitor):
faithless, unfaithfulFrom the ODE community, based on WordNetadd/edit