aggression
noun
ag·gres·sion
| \ ə-ˈgre-shən
\
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Definition of aggression
1
: a forceful action or procedure (such as an unprovoked attack) especially when intended to dominate or master
2
: the practice of making attacks or encroachments
especially
: unprovoked violation by one country of the territorial integrity of another
warned that any act of aggression could start a war
3
: hostile, injurious, or destructive behavior or outlook especially when caused by frustration
Aggression is often the expression of pent-up rage.