The final primary emotion pair of opposites are Aggression and Alarm.

Merriam-Webster defines Aggression as,

: a forceful action or procedure (as an unprovoked attack) especially when intended to dominate or master

: the practice of making attacks or encroachments; especially : unprovoked violation by one country of the territorial integrity of another

: hostile, injurious, or destructive behavior or outlook especially when caused by frustration

In Plutchik’s Wheel of Emotions, Aggression is blend of the basic emotions, Anger and Anticipation.

Aggression has similar physical markers to Anger. These include rapid heartbeat and breathing, dry mouth, sweating, muscle tension and shaking. At the same there are a mix of emotional feelings, including frustration, hostility, anxiety, impatience and restlessness. There is the Anticipation of physical and verbal violence.

Aggression in animals developed to confer advantages. These advantages have to do with protecting territory, mates, offspring or food.

Aggression in humans is more complex, and besides the biological drivers, is also driven by social and cultural factors and morals. For example, some societies are more comfortable with physical punishment of children. In some cultures, honor killings are acceptable. Morals define acceptable limits and aggression can result when experiencing behavior that is outside those limits.

The artist for the Caricature series of sketches depicted Aggression through an image of a person holding a baseball bat. The person is red in the face with flames of anger coming out their head. The teeth are bared in grimace. The baseball bat in the person’s hand points to the imminent violence.

The emotion Aggression in the Caricature series of sketches

The emotion Aggression in the Caricature series of sketches

The artist for Watercolors shows Aggression through a primal picture of a dog baring its teeth, with lips drawn back in a snarl. You can almost hear the growl emanating from the dog’s throat. The dog is ready to unleash aggression and snap at the outstretched hand.

The emotion Aggression in the Caricature series of sketches

The emotion Aggression in the Watercolor series of sketches