- treacherous
- I(Roget's IV) modif.1. [Traitorous]Syn. treasonable, falsehearted, unfaithful, faithless; see false 1 .2. [Unreliable]Syn. deceptive, undependable, dangerous, risky, misleading, tricky, dissembled, untrustworthy, deceitful, false, twofaced, ensnaring, faulty, precarious, unstable, insecure, shaky, slippery, ticklish, difficult, ominous, alarming, menacing.Ant. reliable*, Dependable, steady.See Synonym Study at faithless .II(Roget's 3 Superthesaurus) a.1. disloyal traitorous, backstab-bing, untrue, unfaithful, duplicitous, double-dealing, two-faced, Janus-faced, perfidious, treasonous, *like a snake in the grass.2. unreliable untrustworthy, insecure, hazardous, slippery, undependable, precarious, dangerous, unsafe, unstable, shaky.ANT.: 1. loyal, true, faithful. 2. safe, secure, reliableIII(Roget's Thesaurus II) adjective 1. Not true to duty or obligation: disloyal, faithless, false, false-hearted, perfidious, recreant, traitorous, unfaithful, untrue. See CONTINUE, TRUST. 2. Involving possible risk, loss, or injury: adventurous, chancy, dangerous, hazardous, jeopardous, parlous, perilous, risky, unsafe, venturesome, venturous. Slang: hairy. See SAFETY.
English dictionary for students. 2013.