Lacking due respect or dutifulness: impious toward one's parents. (adjective)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "impious" in a sentence
"There are a hundred religions on earth which all condemn us if we believe your dogmas, which they call impious and absurd; why, therefore, not examine these dogmas?"
"Now kesil signifies in Hebrew "impious", adjectives expressive of the stupid criminality which belongs to the legendary character of giants; and the stars of Orion irresistibly suggest a huge figure striding across the sky."
"Satan, in impious mimicry of God's heavenly throne, sets up his earthly throne (Re 4: 2)."