Adjacent Words

Perfidious definitions

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Webster's 1828 Dictionary

PERFID'IOUS, a. [L. perfidus; per and fidus, faithful. Per in this word signifies through, beyond, or by, aside.]
1. Violating good faith or vows; false to trust or confidence reposed; treacherous; as a perfidious agent; a perfidious friend. [See Perfidy.]
2. Proceeding from treachery, or consisting in breach of faith; as a perfidious act.
3. Guilty of violated allegiance; as a perfidious citizen; a man perfidious to his country.

WordNet (r) 3.0 (2005)

adj
1: tending to betray; especially having a treacherous character as attributed to the Carthaginians by the Romans; "Punic faith"; "the perfidious Judas"; "the fiercest and most treacherous of foes"; "treacherous intrigues" [syn: punic, perfidious, treacherous]

Merriam Webster's

adjective Date: 1572 of, relating to, or characterized by perfidy Synonyms: see faithless • perfidiously adverb • perfidiousness noun

Webster's 1913 Dictionary

Perfidious Per*fid"i*ous (p[~e]r*f[i^]d"[i^]*[u^]s; 277), a. [L. perfidious.] 1. Guilty of perfidy; violating good faith or vows; false to trust or confidence reposed; teacherous; faithless; as, a perfidious friend. --Shak. 2. Involving, or characterized by, perfidy. ``Involved in this perfidious fraud.'' --Milton.

Collin's Cobuild Dictionary

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. = treacherous ADJ: usu ADJ n

Soule's Dictionary of English Synonyms

a. 1. Faithless, unfaithful, venal, treacherous, false, dishonest, disloyal, doublefaced, traitorous, false-hearted, deceitful, untrustworthy. 2. Treacherous, traitorous, false, disloyal, dishonest. 3. Perjured, forsworn, faithless, false.

Moby Thesaurus

Machiavellian, alienated, ambidextrous, artful, corrupt, crafty, crooked, cunning, deceitful, disaffected, dishonest, disloyal, double, double-dealing, double-faced, double-minded, double-tongued, doublehearted, duplicitous, estranged, faithless, false, false-principled, falsehearted, hypocritical, insidious, mercenary, recreant, shifty, slippery, traitorous, treacherous, treasonable, treasonous, tricky, two-faced, unfaithful, unloyal, untrue, venal