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1. Dictionary

   per·fid·i·ous

   /pərˈfidēəs/

   adjective

   • 1. deceitful and untrustworthy: literary "a perfidious lover"

   Word Origin late 16th century: from Latin perfidiosus, from perfidia ‘treachery’.

   Derivatives

   • 1. perfidiously adverb
   • 2. perfidiousness noun

   Scrabble Points: 16

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   More definitions, origin and scrabble points

2. www.merriam-webster.com › dictionary › perfidiousPerfidious Definition & Meaning - Merriam-Webster

   www.merriam-webster.com › dictionary › perfidious

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   The meaning of PERFIDIOUS is of, relating to, or characterized by perfidy. How to use perfidious in a sentence. Did you know? Synonym Discussion of Perfidious.

3. dictionary.cambridge.org › dictionary › englishPERFIDIOUS | English meaning - Cambridge Dictionary

   dictionary.cambridge.org › dictionary › english

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   unable to be trusted, or showing no loyalty: She described the new criminal bill as a perfidious attack on democracy. Synonym. treacherous. SMART Vocabulary: related words and phrases. Disloyalty, betrayal & treason. adulterous. backstabber. betrayal. betrayer. break ranks idiom. chicane. deserter. desertion. faithlessly. faithlessness. false.

4. www.collinsdictionary.com › dictionary › englishPERFIDIOUS definition and meaning | Collins English Dictionary

   www.collinsdictionary.com › dictionary › english

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   If you describe someone as perfidious, you mean that they have betrayed someone or cannot be trusted. [ literary ] Their feet will trample on the dead bodies of their perfidious aggressors.

5. www.vocabulary.com › dictionary › perfidiousPerfidious - Definition, Meaning & Synonyms - Vocabulary.com

   www.vocabulary.com › dictionary › perfidious

   If someone accuses you of being perfidious, you should probably be offended — it means underhanded, treacherous, deceitful — even evil. If you betray people often, you're perfidious: traitors are extremely perfidious.

6. www.thefreedictionary.com › perfidiousPerfidious - definition of perfidious by The Free Dictionary

   www.thefreedictionary.com › perfidious

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   adjective. Not true to duty or obligation: disloyal, faithless, false, false-hearted, recreant, traitorous, treacherous, unfaithful, untrue. The American Heritage® Roget's Thesaurus.

7. dictionary.cambridge.org › us › dictionaryPERFIDIOUS | definition in the Cambridge English Dictionary

   dictionary.cambridge.org › us › dictionary

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   unable to be trusted, or showing no loyalty: She described the new criminal bill as a perfidious attack on democracy. Synonym. treacherous. SMART Vocabulary: related words and phrases. Disloyalty, betrayal & treason. adulterous. backstabber. betrayal. betrayer. break ranks idiom. chicane. deserter. desertion. faithlessly. faithlessness. false.

8. www.oxfordlearnersdictionaries.com › english › perfidiousperfidious adjective - Definition, pictures, pronunciation and...

   www.oxfordlearnersdictionaries.com › english › perfidious

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   Definition of perfidious adjective in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

9. www.oed.com › dictionary › perfidious_adjperfidious, adj. meanings, etymology and more - Oxford English...

   www.oed.com › dictionary › perfidious_adj

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   Meaning & use. Pronunciation. Forms. Frequency. Compounds & derived words. Factsheet. What does the adjective perfidious mean? There is one meaning in OED's entry for the adjective perfidious. See ‘Meaning & use’ for definition, usage, and quotation evidence. See meaning & use. How common is the adjective perfidious?

10. www.britannica.com › dictionary › perfidiousPerfidious Definition & Meaning | Britannica Dictionary

    www.britannica.com › dictionary › perfidious

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    PERFIDIOUS meaning: not able to be trusted showing that someone cannot be trusted

11. www.dictionary.com › browse › perfidiousPERFIDIOUS Definition & Meaning | Dictionary.com

    www.dictionary.com › browse › perfidious

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    Perfidious definition: deliberately faithless; treacherous; deceitful. See examples of PERFIDIOUS used in a sentence.