Delirious means wildly confused from fever, or wildly excited. Delirious with fever, a delirious crowd, deliriously happy.
In medicine delirium is a sudden change in mental state, common in older patients in hospital and often the first sign of an infection — it is treated as an emergency because the cause usually is one. The Latin means to go out of the furrow while ploughing.
1adjectivedeliriousWildly confused from fever, or wildly excited.
“With a high fever, the child became delirious and talked about things that weren't there.”
delirious is a state of mind.
Latin delirus means crazy, from delirare, to go off the furrow — de plus lira, a furrow.
From delirium ous; see also Latin delirus (“silly, doting, crazy”).
Etymology from Wiktionary, CC BY-SA