atroc-, atroci- +
(Latin: cruel, fierce; dark-looking, gloomy)
atrocious
1. Appallingly bad; abominable; such as, he has atrocious behavior.
2. Extremely evil or cruel; monstrous: "They committed atrocious crimes."
atrociously
1. In a terrible manner.
2. To an extravagant or immoderate degree.
3. With enormous cruelty or guilt.
atrociousness
The quality of being shockingly cruel and inhumane.
atrocity, atrocities
1. The quality of being shockingly cruel and inhumane.
2. An appalling act, situation, or object; especially, an act of unusual or illegal cruelty inflicted by an armed force on civilians or prisoners.