Meaning of the word treachery in English

What does treachery mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

treachery

US /ˈtretʃ.ɚ.i/
UK /ˈtretʃ.ər.i/
"treachery" picture

Noun

behavior that involves not being loyal to a person who trusts you; betrayal of trust

Example:
He was punished for his treachery against the king.
The story is full of treachery and deceit.