Etymology
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delirious (adj.)

1703, "wandering in the mind, affected with delirium" (as a result of fever or illness), from stem of delirium + -ous. The earlier adjective was delirous (1650s). Figurative sense of "characterized by or proceeding from wild excitement or exaggerated emotion" is by 1791. Related: Deliriously; deliriousness.

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Definitions of delirious

delirious (adj.)
experiencing delirium;
Synonyms: hallucinating
delirious (adj.)
marked by uncontrolled excitement or emotion;
a crowd of delirious baseball fans
Synonyms: excited / frantic / mad / unrestrained
From wordnet.princeton.edu