perfidious

Synonyms

disloyal, faithless, false, fickle, inconstant, recreant, traitorous, treacherous, unfaithful, untrue;

Antonyms

constant, dedicated, devoted, devout, faithful, fast, loyal, staunch (also stanch), steadfast, steady, true;

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;

Related Words

irresponsible, trustless, undependable, unreliable, untrustworthy;

faltering, hesitant, vacillating, wavering;

dubious, irresolute, uncertain;

apathetic, dispassionate, uninterested;