Synonym: punic, treacherous. Similar words: insidious, invidious, fastidious, fastidiously, perfidy, odious, tedious, studious. Meaning: [pər'fɪdɪəs /pə'-] 
adj. tending to betray; especially having a treacherous character as attributed to the Carthaginians by the Romans.
adj. tending to betray; especially having a treacherous character as attributed to the Carthaginians by the Romans. 
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1, She described the new criminal bill as a perfidious attack on democracy.
2, Your perfidious gossip is malicious and dangerous.
3, The company was betrayed by its perfidious allies.
4, Woman is perfidious and disingenuous.
5, Even perfidious Anglo - Saxons agree on the need for change.
6, It was the most perfidious and dangerous dive bomber the Germans had.
7, The perfidious military attack on our fatherland, begun on 22 June by Hitler's Germany, is continuing.
8, Perfidious act fund, the main body of the general fund managers, the general performance behavior operation of the Fund for the use of the information received, prior to the transaction with the Fund.
9, Punic faith; the perfidious Judas; the fiercest and most treacherous of foes; treacherous intrigues.
10, Their feet will trample on the dead bodies of their perfidious aggressors.
11, Nicasio gave Cecilia poisoned water,(http://sentencedict.com/perfidious.html) believing she would reveal his perfidious acts.
12, The air was thick with paranoia as the conversation turned to the perfidious question of appearance money.
13, In your language traitor means betrayer : one is perfidious, treacherous, unfaithful, disloyal.
14, When Caesar realized that Brutus had betrayed him, he reproached his perfidious friend.
More similar words: insidious, invidious, fastidious, fastidiously, perfidy, odious, tedious, studious, commodious, melodious, incommodious, compendious, superficial, superficiality, come under fire, idiot, idiom, idiotic, idiomatic, idiopathic, idiosyncrasy, idiosyncratic, superfluous, ridiculous, pious, serious, envious, bilious, noxious, furious.