Antonyms of adj impious

2 senses of impious

Sense 1
impious (vs. pious) -- (lacking piety or reverence for a god)

pious (vs. impious) -- (having or showing or expressing reverence for a deity; "pious readings")
        => devotional -- (relating to worship; "a devotional exercise")
        => godly, reverent, worshipful -- (showing great reverence for god; "a godly man"; "leading a godly life")
        => holier-than-thou, pietistic, pietistical, pharisaic, pharisaical, sanctimonious, self-righteous -- (excessively or hypocritically pious; "a sickening sanctimonious smile")
        => prayerful -- (disposed to pray or appearing to pray)

Sense 2
impious, undutiful -- (lacking due respect or dutifulness; "impious toward one's parents"; "an undutiful son")

INDIRECT (VIA disrespectful) -> respectful -- (full of or exhibiting respect; "respectful behavior"; "a respectful glance")

Similarity of adj impious

2 senses of impious

Sense 1
impious (vs. pious) -- (lacking piety or reverence for a god)
       => godless, irreverent -- (not revering god)
          Also See-> irreligious#1; profane#2, secular#3; wicked#1

Sense 2
impious, undutiful -- (lacking due respect or dutifulness; "impious toward one's parents"; "an undutiful son")
       => disrespectful (vs. respectful) -- (exhibiting lack of respect; rude and discourteous; "remarks disrespectful of the law"; "disrespectful in the presence of his parents"; "disrespectful toward his teacher")