the offense of acting to overthrow one's government or to harm or kill its sovereign.

a violation of allegiance to one's sovereign or to one's state.

the betrayal of a trust or confidence; breach of faith; treachery.

noun

allegiance , devotion , faithfulness , fidelity , loyalty

noun

breach of faith , crime , deceit , deceitfulness , deception , disaffection , dishonesty , duplicity , faithlessness , lse- majest , mutiny , perfidy , revolt , revolutionary , sedition , seditious act , seditiousness , subversion , traitorousness , treachery , treacherousness , betrayal , disloyalty , lese majesty