From Latin word FEROX: Courageous, Spirited, Strong, Warlike, Gallant.
IOUS: This suffix means having or being like the word it follows.
First known use: 1646
"But if you are ferocious in battle, remember to be magnanimous in victory."
Colonel Tim Collins, British Army Officer
Ex. 2: What do you mean you scored us comped front row seats to the Madonna concert? You're ferocious.