noun, plural im·pi·e·ties.
- lack of piety; lack of reverence for God or sacred things; irreverence.
- lack of dutifulness or respect.
- an impious act, practice, etc.
noun plural -ties
- lack of reverence or proper respect for a god
- any lack of proper respect
- an impious act
mid-14c., from Old French impieté (12c.), from Latin impietatem (nominative impietas) “irreverence, ungodliness; disloyalty, treason,” noun of quality from impius (see impious).