Truculent

truculent \ˈtrək-lənt\ adjective: 1. feeling or displaying ferocity; cruel, savage, 2. deadly, destructive, 3. scathingly harsh; vitriolic {truculent criticism},
 4. aggressively self-assertive; belligerent

Etymology: Latin truculentus, from truc-, trux savage

Truculent may have many senses to it, but they all spell trouble.