treasonable
Against one's nation
Treasonable describes actions, words, or intentions that constitute or suggest treason—betrayal of one's country or sovereign.
The word appears in legal and political contexts: treasonable acts, treasonable correspondence with the enemy.
It carries the gravity of the underlying crime, implying conduct that could be prosecuted as treason.
Traitorous is a near synonym with slightly broader application.
One who betrays allegiance
- quislingTreasonous occupation collaborator
- defectorOne who abandons allegiance
- renegadeDeserter of a cause
- apostateOne who renounces faith
collaborator · informer · spy · saboteur · betrayer · double-crosser · conspirator · seditionist
Inciting rebellion against state
- punishableWarranting official sanction
- criminalPerson who breaks laws
- indictableAble to be charged
- prosecutableAble to face legal action
felonious · unlawful · actionable · capital · hanging · execution · tribunal · attainder
Deliberate violation of trust
- conspiracyClandestine coordinated scheming
- espionageCovert intelligence gathering
- perfidyDeliberate breach of trust
- collusionFraudulent secret cooperation
sabotage · subversion · defection · double-cross · backstabbing · intrigue · undermining · breach
turncoat
One who betrays allegiance
- quislingTreasonous occupation collaborator
- defectorOne who abandons allegiance
- renegadeDeserter of a cause
apostate · collaborator · informer · spy · saboteur · betrayer · double-crosser · conspirator · seditionist · insurgent
seditious
Inciting rebellion against state
- punishableWarranting official sanction
- criminalPerson who breaks laws
- indictableAble to be charged
prosecutable · felonious · unlawful · actionable · capital · hanging · execution · tribunal · attainder · impeachable
treachery
Deliberate violation of trust
- conspiracyClandestine coordinated scheming
- espionageCovert intelligence gathering
- perfidyDeliberate breach of trust
collusion · sabotage · subversion · defection · double-cross · backstabbing · intrigue · undermining · breach · leakage