truculence

1. A disposition or apparent disposition to fight, especially fiercely.
2. Ferociously cruel actions or behavior.

noun

1. Warlike or hostile attitude or nature: bellicoseness, bellicosity, belligerence, belligerency, combativeness, contentiousness, hostility, militance, militancy, pugnaciousness, pugnacity, truculency. See attack/defend.
2. The power or will to fight: bellicoseness, bellicosity, belligerence, belligerency, combativeness, contentiousness, fight, pugnaciousness, pugnacity, truculency. See conflict/cooperation.
3. A cruel act or an instance of cruel behavior: barbarity, bestiality, brutality, cruelty, inhumanity, savagery, truculency. See attitude/good attitude/bad attitude/neutral attitude, kind/cruel.

The noun has one meaning:

Meaning #1: obstreperous and defiant aggressiveness
  Synonym: truculency