Irreligious

1. (a.) Indifferent to religion; ungodly; not controlled by religious motives or principles.

2. (a.) Indicating a want of religion; profane; wicked; as, irreligious speech.

Thesaurus Entries

amoral, apostate, atheistic, backsliding, blasphemous, creedless, disbelieving, faithless, fallen, fallen from grace, godless, heretical, impious, incredulous, indevout, irreverent, lapsed, minimifidian, nonbelieving, nonreligious, nullifidian, profanatory, profane, recidivist, recidivistic, recreant, renegade, repudiative, sacrilegious, sinful, un-Christly, unangelic, unbelieving, unchristian, unconfident, unconverted, unconvinced, undevout, undutiful, ungodly, unholy, unmoral, unreligious, unrighteous, unsaintly, wicked, without faith