delusive

delude +‎ -ive

delusive (comparative more delusive, superlative most delusive)

1. Producing delusions.
2. Delusional.
3. Inappropriate to reality; forming part of a delusion.
   • 1849, Charlotte Brontë, Shirley

     It seemed calculated to suggest ideas she had no intention to suggest — ideas delusive and disturbing.

   • 1885, Miguel de Cervantes Saavedra, “Of the Wonderful Things the Incomparable Don Quixote Said He Saw in the Profound Cave of Montesinos, the Impossibility and Magnitude of which Cause this Adventure to be Deemed Apocryphal”, in John Ormsby, transl., The Ingenious Gentleman Don Quixote of La Mancha […] In Four Vols, volume III, London: Smith, Elder & Co. […], OCLC 906154755, part II, page 249:

     I opened my eyes, I rubbed them, and found I was not asleep but thoroughly awake. Nevertheless, I felt my head and breast to satisfy myself whether it was I myself who was there or some empty delusive phantom; but touch, feeling, the collected thoughts that passed through my mind, all convinced me that I was the same then and there that I am this moment.