irreligious

adjectives

hostile or indifferent to religion
irreligious
is derived from
irreligiousness
antonym
religious
is similar to
rejecting any belief in gods
atheistic, atheistical, unbelieving
is similar to
not acknowledging the God of Christianity and Judaism and Islam
ethnic, heathen, heathenish, pagan
is similar to
no longer active or practicing
"a lapsed Catholic"
lapsed, nonchurchgoing
is similar to
failing or refusing to observe religious customs
nonobservant
see also
lacking piety or reverence for a god
impious