fierceness means the state of being fierce. Lexicurio rates it Rare gem — a strength score of 71 out of 100.
Etymology
From Middle English fersnesse; equivalent to fierce + -ness.
noun
- The state of being fierce.“I stroked it gently, on which the mutinous rogue seemed to swell, and gather a new degree of fierceness and insolence; so that finding it grew not to be trifled with any longer, I prepar'd for rubbers in good earnest.”