perfidious

per·fid·i·ous

adj \(ˌ)pər-ˈfi-dē-əs\

Definition of PERFIDIOUS

: of, relating to, or characterized by perfidy

— per·fid·i·ous·ly adverb

— per·fid·i·ous·ness noun

Examples of PERFIDIOUS

1. We were betrayed by a perfidious ally.
2. <a perfidious campaign worker revealed the senator's strategy to his leading rival for the nomination>

First Known Use of PERFIDIOUS

1572

Related to PERFIDIOUS

Synonyms: disloyal, false, fickle, inconstant, faithless, recreant, traitorous, treacherous, unfaithful, untrue

Antonyms: constant, dedicated, devoted, devout, down-the-line, faithful, fast, loyal, staunch (also stanch), steadfast, steady, true

Related Words: irresponsible, trustless, undependable, unreliable, untrustworthy; faltering, hesitant, vacillating, wavering; dubious, irresolute, uncertain; apathetic, dispassionate, uninterested

Near Antonyms: dependable, dutiful, reliable, responsible, solid, tried, tried-and-true, trustable, trustworthy, trusty; unfaltering, unhesitating, unwavering; determined, intent, resolute; confirmed, dyed-in-the-wool, inveterate, sworn; ardent, avid, enthusiastic, fervent, fervid, impassioned, passionate

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See Synonym Discussion at faithless

Rhymes with PERFIDIOUS

fastidious, insidious, invidious