Yes, it is. It is the adjective form of the noun treachery, which can mean villainy, perfidy, or disloyalty. But treacherous can also mean fraught with danger (a treacherous section of the road).
Cold temperatures, a foot of snow, and icy roads made driving treacherous. He enjoys mountain climbing despite treacherous terrain.
Dangerous
dangeroushazardousominousperilousprecariousriskyunsafe
the noun would be treachery.
The adjective form of triangle is triangular.
The word treacherous is an adjective. It describes someone who exhibits treachery.
Synonyms for the adjective treacherous are traitorous, treasonous, disloyal, faithless, unfaithful, false, insidious, or deceitful.
Synonyms for the adjective treacherous are traitorous, treasonous, disloyal, faithless, unfaithful, false, insidious, or deceitful.
That man is treacherous
The roads were treacherous because of the snowstorm.
There are some possible related words: TREACHEROUS (adjective) - evil, or dangerous (as with a mountain road) TREACHERY, TREACHERIES (noun) - acts of treason or betrayal
The treacherous ice is best to avoid The treacherous path through the woods had never been traveled before.
This example of how to use treacherous in a sentence is treacherous. The raging storm on the ocean was treacherous with fifty foot waves. No one could travel on the ocean. When the treacherous hurricane subsided the Coast Guard found many boats damaged and ships were sunk.
A treacherous person is someone who is dangerous and will betray others.
The Treacherous Three - album - was created in 1980.
The treacherous path through the dense forest was fraught with hidden dangers and sudden pitfalls.
It was a treacherous hike to the top of the mountain.