Merriam-Webster's Word of the Day for October 4, 2023 is:

splenetic • \splih-NET-ik\  • adjective

Splenetic is a formal word that typically describes expressions of sharp annoyance and anger.

// The newspaper publisher's splenetic editorials often struck fear into local politicians.

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Examples:

"A strange combination of intricate, almost sci-fi-inflected psychological thriller, splenetic social-breakdown broadside and two-hander (torture) chamber drama, it is an exercise in bravura filmmaking applied to a story so relentlessly grim you might wish it were a little less well-made, giving you an excuse to look away." — Jessica Kiang, Variety, 8 Sept. 2022

Did you know?

To vent one’s spleen is to express anger. There are healthy ways of doing this, of course, but vent too much of your spleen, or vent it too often, and you may be accused of being splenetic. Both spleen and splenetic trace back to the Latin word splen, which refers to the bodily organ responsible for storing and filtering blood, among other functions. So why the association with anger? In early Western physiology, a person's physical qualities and mental disposition were believed to be determined by the proportion of four bodily humors: blood, phlegm, yellow bile, and black bile. The last of these was believed to be secreted by the spleen, and to cause feelings and dispositions ranging from intense sadness (melancholia) to anger and violent temper—hence splenetic. In later years, the "melancholy" sense fell out of use (and the theory of the humors was discredited), but the "angry" sense of splenetic remains with us today.