un·ho·ly / ˌənˈhōlē/ • adj. (-li·er, -li·est) sinful; wicked. ∎ not holy; unconsecrated: an unholy marriage. ∎ denoting an alliance with potentially harmful implications between two or more parties that are not natural allies: an unholy alliance between economic and political power. ∎ inf. awful; dreadful (used for emphasis): she was making an unholy racket.DERIVATIVES: un·ho·li·ness n.