treacherous

Meanings

1. 1
   adj

   tending to betray

   especially having a treacherous character as attributed to the Carthaginians by the Romans

2. 2
   adj

   dangerously unstable and unpredictable

   treacherous winding roads

3. 3
   adj

   Exhibiting treachery.

   I see the wife misused by her husband, I see the treacherous seducer of young women, / I mark the ranklings of jealousy and unrequited love attempted to be hid […]

4. 4
   adj

   Unreliable; dangerous.

   a treacherous mountain trail

5. 5
   adj

   Deceitful; inclined to betray.

Etymology

From Old French trecheros, tricheros (“deceitful”), equivalent to treacher + -ous. See treacher.