Synonyms for treacherous

modified

1. Traitorous

   treasonable, falsehearted, unfaithful, faithless; see false 1.

2. Unreliable

   deceptive, undependable, dangerous, risky, misleading, tricky, dissembled, untrustworthy, deceitful, false, twofaced, ensnaring, faulty, precarious, unstable, insecure, shaky, slippery, ticklish, difficult, ominous, alarming, menacing.

   Antonyms reliable*, dependable, steady. See syn. study at faithless.faithless.