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  1. Pathology. affected with or characteristic of delirium.
  2. wild with excitement, enthusiasm, etc.: She was delirious with joy at the news.
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Origin of delirious

First recorded in 1590–1600; deliri(um) + -ous
Related formsde·lir·i·ous·ly, adverbde·lir·i·ous·ness, nounnon·de·lir·i·ous, adjectivenon·de·lir·i·ous·ly, adverbnon·de·lir·i·ous·ness, nounun·de·lir·i·ous, adjectiveun·de·lir·i·ous·ly, adverb

Synonyms for delirious

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2. thrilled, excited, ecstatic.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Related Words for delirious

insane, unhinged, maniacal, manic, crazed, mad, frenzied, ecstatic, delighted, intoxicated, rapturous, rabid, frantic, hysterical, aberrant, bewildered, confused, crazy, demented, deranged

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British Dictionary definitions for delirious


  1. affected with delirium
  2. wildly excited, esp with joy or enthusiasm
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Derived Formsdeliriously, adverbdeliriousness, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for delirious


1703, from stem of delirium + -ous. Figurative use attested from 1791. Related: Deliriously.

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Online Etymology Dictionary, © 2010 Douglas Harper

delirious in Medicine


  1. Of, suffering from, or characteristic of delirium.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.