The quality or state of being delirious; the condition of having delirium or extreme mental confusion.
From 'delirious' (adjective) + '-ness' (English suffix forming abstract nouns), creating a noun that describes the abstract quality of delirium or extreme excitement.
Adding '-ness' to psychological terms creates a unique English pattern—'deliriousness' suggests a measurable degree of confusion, as if doctors could rate how delirious a patient is on a scale.
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