Aggression is hostile, purposely unfriendly behavior that can sometimes be violent. A motorist who shows aggression for another may follow too closely, honk the horn, or otherwise try to intimidate.

When someone deliberately tries to make another person feel intimidated or threatened, it's an act of aggression. Forceful, unfriendly behavior towards others is one example of aggression, and one country's hostile action toward another is also a kind of aggression. It's been used since the 1600s to mean "an unprovoked attack," from the Latin root word aggressionem, "attack," and in 1912 aggression was first used to mean generally "hostile behavior."

Definitions of aggression

n a disposition to behave aggressively

Type of:
an unfriendly disposition

n a feeling of hostility that arouses thoughts of attack

Type of:
enmity, hostility, ill will
the feeling of a hostile person

n violent action that is hostile and usually unprovoked

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meat grinder
any action resulting in injury or destruction
force, violence
an act of aggression (as one against a person who resists)
pillage, pillaging, plundering
the act of stealing valuable things from a place
domestic violence
violence or physical abuse directed toward your spouse or domestic partner; usually violence by men against women
the practice of plundering in gangs
rape, rapine
the act of despoiling a country in warfare
looting, robbery
plundering during riots or in wartime
despoilation, despoilment, despoliation, spoil, spoilation, spoliation
the act of stripping and taking by force
devastation, ravaging
plundering with excessive damage and destruction
depredation, predation
an act of plundering and pillaging and marauding
the plundering of a place by an army or mob; usually involves destruction and slaughter
road rage
violence exhibited by drivers in traffic
public violence, riot
a public act of violence by an unruly mob
Type of:
something done (usually as opposed to something said)

n the act of initiating hostilities

Type of:
armed combat, combat
an engagement fought between two military forces

n deliberately unfriendly behavior

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aggravation, irritation, provocation
unfriendly behavior that causes anger or resentment
aggressive remarks and behavior like that of a spiteful malicious woman
bullying, intimidation
the act of intimidating a weaker person to make them do something
hell raising, raising hell
making trouble just for the fun of it
the act of asserting yourself in an aggressive manner
(informal British usage) aggravation or aggression
last straw
the final irritation that stretches your patience beyond the limit
frightening, terrorisation, terrorization
the act of inspiring with fear
taunt, taunting, twit
aggravation by deriding or mocking or criticizing
Type of:
behavior, behaviour, conduct, doings
manner of acting or controlling yourself

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