disloyal
🇺🇸
/dɪsˈlɔɪəl/
🇬🇧
/dɪsˈlɔɪəl/
not faithful or supportive to someone or something you should be loyal to
She felt hurt when her friend was disloyal and shared her secret with others.
友人が不誠実で、彼女の秘密を他人に話したとき、彼女は傷つきました。