treacherously

UK
/ˈtrɛtʃ.ər.əs.li/
US
/ˈtrɛtʃ.ər.əs.li/
treacherouslyadverb
UK
/ˈtrɛtʃ.ər.əs.li/
US
/ˈtrɛtʃ.ər.əs.li/
Translations
He treacherously betrayed his friends.
Он предательски предал своих друзей.
Definitions
In a manner that is dangerously unstable or unpredictable.
The path was treacherously icy, making it difficult to walk without slipping.
In a way that involves betrayal or deception.
He treacherously revealed his friend's secret to the entire group.