1.Definition: extremely evil or cruel; expressive of cruelty or befitting hell

"Unholy grimaces"

Related Adjective(s):demonic, diabolic, diabolical, fiendish, hellish, infernal, satanic

2.Definition: having committed unrighteous acts

Related Adjective(s):sinful, wicked

3.Definition: not hallowed or consecrated

Related Adjective(s):unhallowed