Anger or wrath was an emotion that could be expressed about any lifeform, inanimate object, time period, or spatial area. It was typically characterized as strong feeling of hostility, annoyance, or displeasure, and as well, was a relative state that could cause one to be capable of doing violence. (TOS: "Wolf in the Fold") An uncontrolled fit of anger and frustration was known as a tantrum.
The presence of Redjac was described by Sybo as "fear, anger, hatred" and that "Anger feeds the flame." (TOS: "Wolf in the Fold")
According to Lokai, he acted like a madman "out of the anger and frustration" that Bele forced upon him in order to prove that Lokai was a madman. (TOS: "Let That Be Your Last Battlefield")
Early symptoms of the Vulcan disease Bendii Syndrome included "sudden bursts of emotion, mostly irrational anger. Eventually, all emotional control is lost." (TNG: "Sarek")
Anger, hatred and revenge were among the many Human emotions that Data did not fully comprehend. (TNG: "Data's Day", "Inheritance")
After observing the civil break up on Julian Bashir and Leeta in 2372, Quark expressed his disappointment in the lack of "fireworks", asking, "Where's the anger, the vicious name-calling, the irrational accusations?" (DS9: "Let He Who Is Without Sin...")