IPA: /ɪmˈpaɪəsli/
KK: /ɪmˈpaɪəsli/
In a way that shows a lack of respect for God or sacred things; behaving in a wicked or irreverent manner.
He spoke impiously about the traditions that others held dear.
Impiously → It is formed from "im-" (meaning not) and "pius" (from Latin, meaning dutiful or pious) and the suffix "-ly" (meaning in a manner). The word "impiously" describes an action done in a manner that is not dutiful or respectful, particularly towards religion or the divine.
Think of 'not' ('im-') being combined with 'dutiful' ('pius') to remember that 'impiously' means acting in a way that is disrespectful or irreverent.