General disloyalty:
* Treacherous: This implies a betrayal of trust, often involving danger or harm.
* Faithless: This emphasizes a lack of commitment and fidelity.
* Unfaithful: This is a broader term for not being loyal, often used in romantic contexts.
* Devious: This suggests a sneaky or manipulative approach to disloyalty.
* Two-faced: This implies a person who is deceitful and dishonest.
More specific disloyalty:
* Renegade: This refers to someone who abandons their group or cause.
* Traitor: This is a strong term used for someone who betrays their country or a cause.
* Turncoat: This implies someone who switches sides or allegiances.
* Backstabber: This describes someone who betrays a friend or colleague behind their back.
* Judas: This is a biblical reference to someone who betrays their friend for personal gain.
The best word to use will depend on the context and the specific type of disloyalty you want to describe.