Aggression (noun)

1. Forceful and sometimes unjust or unprovoked action or attack against another.
2. Assertive or attention-seeking behavior.

Origin:

Late middle english (in the sense "attack, hostile action"): from latin aggressio(n-), from aggredi "attack, go to meet", from ad- "to" + gradi "go, step".

Examples:

1. The aggression of the other team led to multiple penalties.
2. The aggression of the dog was unexpected.
3. The police used aggression to control the crowd.
4. The aggression of the salesperson put me off.
5. The company's aggressive expansion plans led to criticism.