'Disloyal' often implies betrayal, suggesting a violation of trust. His disloyal decision to share company secrets betrayed his employer's trust.
Pro Tip 2/3
Strong Emotions
Using 'disloyal' can evoke strong negative feelings, such as hurt or anger. She felt disloyal when she realized she secretly hoped her friend's business would fail.
Pro Tip 3/3
Political Context
'Disloyal' is frequently used in political contexts to describe someone not supporting their party. The senator was accused of being disloyal for voting against the party line.