Synonyms and related words :
Machiavellian, agnostic, ambidextrous, apostate, artful, atheist, atheistic, capricious, changeable, changeful, collaborative, conscienceless, crafty, creedless, crooked, cunning, deceitful, derelict, disaffected, disbelieving, dishonest, disloyal, double, double-dealing, double-faced, double-minded, double-tongued, doublehearted, doubting, duplicitous, FALSE, false-principled, falsehearted, fickle, fluctuating, freethinking, heathen, heretical, hypocritical, inconstant, incredulous, infidel, infidelic, insincere, irreligious, minimifidian, nonbelieving, not true to, nullifidian, of bad faith, pagan, perfidious, recreant, renegade, repudiative, sceptical, shifting, shifty, tergiversant, tergiversating, traitorous, treacherous, treasonable, treasonous, trothless, two-faced, unbelieving, unchristian, unconfident, unconverted, unconvinced, unfaithful, unloyal, unreliable, unscrupulous, unstable, unsteadfast, untrue, untrustworthy, wavering, without faith