splenetic

Concise Oxford English Dictionary © 2008 Oxford University Press:
splenetic /splɪˈnɛtɪk/

▶adjective

• 1 bad-tempered or spiteful.

• 2 archaic term for splenic.

– derivatives
splenetically adverb.

– origin ME (as a noun denoting a person with a diseased spleen): from late L. spleneticus, from Gk splēn (see spleen).