impius

From in- + pius.

• (Classical Latin) IPA^(key): [ˈɪm.pi.ʊs]
• (modern Italianate Ecclesiastical) IPA^(key): [ˈim.pi.us]

impius (feminine impia, neuter impium, comparative magis impius, superlative maximē impius or impiissimus or impīssimus or impientissimus, adverb impiē); first/second-declension adjective

1. disloyal, undutiful
   • 29 BCE – 19 BCE, Vergilius, Aeneis 4.495–497:

     “[...] et arma virī thalamō quae fīxa relīquit
     impius, exuviāsque omnīs, lectumque iugālem
     quō periī: superimpōnās [...].”

     “And the man’s weapons that he left hanging in our bedchamber — [so] disloyal! — and all his clothes, and the bridal bed on which I was ruined: pile [everything] on top [of the pyre].”
     (Dido alludes with disdain to the epic’s recurrent epithet for its hero — e.g.: “Sum pius Aeneas,” 1.378 — now that this so-called dutiful man has abandoned her.)

2. godless, impious, unpatriotic
3. damned, accursed
4. wicked
   • c. 347 CE – 420 CE, Hieronymus, Vulgate Proverbs.28.15:

     leō rugiēns et ursus ēsuriēns prīnceps impius super populum pauperem

     As a roaring lion, and a hungry bear, so is a wicked prince over the poor people. (trans.: Douay-Rheims Bible)

First/second-declension adjective.

• “impius”, in Charlton T. Lewis and Charles Short (1879), A Latin Dictionary, Oxford: Clarendon Press
• “impius”, in Charlton T. Lewis (1891), An Elementary Latin Dictionary, New York: Harper & Brothers
• “impius”, in Gaffiot, Félix (1934), Dictionnaire illustré latin-français, Hachette.