As adjectives the difference between impious and unhallowed
is that impious is not pious while unhallowed is not hallowed or blessed.
impious
English
Adjective
(
en adjective)
not pious
lacking reverence or respect, especially towards a god
unhallowed
English
Adjective
(
en adjective)
Not hallowed or blessed.
- The murderer was buried in unhallowed ground .
Antonyms
* hallowed