un·ho·ly

/ˌʌnˈhoʊli/ adj

1 : not showing respect for a god or a religion : not holy

an unholy attitude

2

— used to describe people or groups that are working together for a bad purpose

an unholy alliance between politicians and lobbyists

3 always used before a noun informal : shockingly or surprisingly bad, large, etc.

Our finances were an unholy mess.

They have spent an unholy amount of money on the project.