Synonyms and related words :
derelict, disaffected, disloyal, disregardful, faithless, FALSE, fickle, inattentive, inconstant, inobservant, negligent, nonadherent, noncompliant, nonconforming, nonobservant, not true to, of bad faith, perfidious, recreant, traitorous, treacherous, trothless, uncompliant, unconforming, unfaithful, unobservant, unsteadfast, untrue