The Collaborative International Dictionary of English v.0.48:

Delirious \De*lir"i*ous\, a. [From Delirium.]
   Having a delirium; wandering in mind; light-headed; insane;
   raving; wild; as, a delirious patient; delirious fancies. --
   De*lir"i*ous*ly, adv. -- De*lir"i*ous*ness, n.
   [1913 Webster]

WordNet (r) 3.0 (2006):

delirious
    adj 1: experiencing delirium [syn: delirious, hallucinating]
    2: marked by uncontrolled excitement or emotion; "a crowd of
       delirious baseball fans"; "something frantic in their
       gaiety"; "a mad whirl of pleasure" [syn: delirious,
       excited, frantic, mad, unrestrained]

Moby Thesaurus II by Grady Ward, 1.0:

130 Moby Thesaurus words for "delirious":
   abandoned, ablaze, afire, all agog, amok, ardent, at fever pitch,
   babbling, bellowing, berserk, bewildered, boiling over, breathless,
   burning, carried away, confused, cordial, corybantic, crazed,
   crazy, delighted, demented, demoniac, deranged, disarranged,
   disordered, distracted, disturbed, dizzy, drunk, ecstatic,
   enraptured, enthused, enthusiastic, excited, exuberant, fanatical,
   febrile, feral, ferocious, fervent, fervid, fevered, feverish,
   feverous, fierce, fiery, flaming, flushed, frantic, frenetic,
   frenzied, fulminating, furious, giddy, glowing, haggard, hearty,
   heated, hectic, hog-wild, hot, howling, hyperpyretic, hyperthermic,
   hysteric, hysterical, impassioned, in a fever, in a transport,
   in hysterics, incoherent, infatuated, inflamed, insane, intense,
   intoxicated, irrational, keen, lightheaded, lively, lunatic, mad,
   madding, maniac, off, on fire, orgasmic, orgiastic, overanxious,
   overdesirous, overeager, overenthusiastic, overexcited,
   overwrought, overzealous, passionate, perfervid, possessed,
   pyretic, rabid, raging, rambling, ramping, ranting, rapturous,
   raving, ravished, red-hot, roaring, running mad, steaming, steamy,
   storming, thrilled, transported, ultrazealous, uncontrollable,
   unhinged, unreasonable, unrestrained, unsettled, vigorous, violent,
   wandering, warm, wild, wild-eyed, wild-looking, zealous