ungodly

Short definition from Wiktionary

Adjective

1. 1
   Of a person: lacking reverence for God; of an action: not in accordance with God's will or religious teachings.
2. 2
   Immoral, sinful, or wicked.
3. 3
   Extreme; unreasonable.

Adverb

1. 1
   In an impious, irreverent, or ungodly manner; ungodlily.