Antonyms of adj irreligious

1 sense of irreligious

Sense 1
irreligious (vs. religious) -- (hostile or indifferent to religion)

religious (vs. irreligious) -- (having or showing belief in and reverence for a deity; "a religious man"; "religious attitude")
        => churchgoing -- (actively practicing a religion)
        => churchly -- (resembling or suggesting or appropriate to a church; "churchlike silence"; "the pure fragrance of churchly incense")
        => devout, god-fearing -- (deeply religious; "a god-fearing and law-abiding people" H.L.Mencken)
        => interfaith -- (involving persons of different religious faiths; "an interfaith marriage"; "interfaith good will")

Similarity of adj irreligious

1 sense of irreligious

Sense 1
irreligious (vs. religious) -- (hostile or indifferent to religion)
       => atheistic, atheistical, unbelieving -- (rejecting any belief in gods)
       => heathen, heathenish, pagan, ethnic -- (not acknowledging the God of Christianity and Judaism and Islam)
       => lapsed, nonchurchgoing -- (no longer active or practicing; "a lapsed Catholic")
       => nonobservant -- (failing or refusing to observe religious customs)
          Also See-> impious#1