The most perfidious way of harming a cause consists of defending it deliberately with faulty arguments.
Source: tatoeba (2259)
Perfidious
//pɚˈfɪdi.əs//
Synonyms for "perfidious" (95 found)
Ranked by relevance and common usage.
Closest matches (19)
Strong matches (29)
Related words (47)
Adjective(24 words)
infidelitousjudaslikejudaslynonfaithfulproditoriousproditoryratlikerenegadereptilianreptitiousswiketraitorishtraitorliketraitorlytraitoroustraitorsometreacheroustreachersometrothlessunfaithful
Show 4 more words
insidiousinsincerelyingmachiavellianmercenaryrecreantrenegadeseditiousshiftyslipperytreasonabletreasonoustrickytwo facedtwo-facedunloyalunreliableunscrupulousuntruevenal
Show 1 more word
Adjective(2 words)
Related word relations
OpenGloss and ConceptNet supply richer edges like generalizations, collocations, and derivations.
Synonyms
4 entriesRelated terms
1 entriesderived
4 entriesrelated to
4 entriessimilar
1 entriesTranslations
36 translations across 17 languages.
Bulgarian
3 entries- вероломен adj (pertaining to perfidy)
- коварен adj (pertaining to perfidy)
- предателски adj (pertaining to perfidy)
Chinese Mandarin
1 entries- 背信弃义的 adj (pertaining to perfidy)
Dutch
3 entries- doortrapt adj (pertaining to perfidy)
- perfide adj (pertaining to perfidy)
- verraderlijk adj (pertaining to perfidy)
Finnish
1 entries- petollinen adj (pertaining to perfidy)
French
1 entries- perfide adj (pertaining to perfidy)
German
1 entries- perfide adj (pertaining to perfidy)
Greek
1 entries- παράσπονδος adj (pertaining to perfidy)
Hungarian
4 entries- alattomos adj (pertaining to perfidy)
- aljas adj (pertaining to perfidy)
- alávaló adj (pertaining to perfidy)
- csalárd adj (pertaining to perfidy)
Ido
1 entries- perfida adj (pertaining to perfidy)
Latin
1 entries- perfidus adj (pertaining to perfidy)
Neapolitan
1 entries- nfame adj (pertaining to perfidy)
Plautdietsch
1 entries- ontru adj (pertaining to perfidy)
Portuguese
2 entries- desleal adj (pertaining to perfidy)
- pérfido adj (pertaining to perfidy)
Russian
3 entries- вероло́мный adj (pertaining to perfidy)
- кова́рный adj (pertaining to perfidy)
- преда́тельский adj (pertaining to perfidy)
Spanish
1 entries- pérfido adj (pertaining to perfidy)
Turkish
2 entries- hain adj (pertaining to perfidy)
- kalleş adj (pertaining to perfidy)
Ukrainian
2 entries- віроломний adj (pertaining to perfidy)
- зрадливий adj (pertaining to perfidy)
Sample sentences
9 total sentences available.
By agreeing to integrate the "Tamazight language" into its educational system, the perfidious and calculating Algerian state wants to annihilate the Kabyle language by creating a diglossia which will in turn create serious learning problems and cross-comprehension issues. Because this "Tamazight language" is full of neologisms, in addition to being an absurd mixture of several Berber languages, that often have no meaning and has no connection with the sociolinguistic reality for all Berbers. In the end, they all lose out.
Source: tatoeba (9502746)
Perfidious Albion!
Source: tatoeba (10687552)
I discovered Troy's perfidious plans.
Source: tatoeba (12366870)
Showing 4 of 9 available sentences.
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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.