Anger

Anger was an emotion.

In response to negative emotions such as fear, grief and anger, humans once took medication in the future, to remove and override them. (AUDIO: Harvest of the Sycorax)

The Tenth Doctor once stated that he could get "so much more [angry]" than he was currently when he discovered that a Floof had killed Kathy. (PROSE: Corner of the Eye)

Tanya Adeola fed the Lankin anger, not grief, poisoning it, which left it in a weakened state. (TV: Nightvisiting)