What is the definition of treachously?

Treachously means in a way that is deceitful and untrustworthy, betraying someone's trust or confidence.

Here are some synonyms for "treachously":

* Betrayingly

* Deceptively

* Faithlessly

* Perfidiously

* Dishonestly

* Cunningly

* Slyly

Example sentence:

The general treachously led his troops into a trap, ensuring their defeat.