undream

un- +‎ dream

undream (third-person singular simple present undreams, present participle undreaming, simple past and past participle undreamed or undreamt)

1. (transitive) To dismiss from the imagination as though never dreamed.
   • 1876, Fanny Wheeler Hart, Miss Hitchcock's Wedding Dress

     Dreams, whether waking or sleeping ones, continue part of us. We can't undream them. We are roused out of them, but they remain.

   • 1880, Theodore Dwight Weld, In Memory: Angelina Grimké Weld

     This is all like a dream now; but I can't undream it, and I can't resist it. I must go.

• unimagine

• unthink

• Mundare, duramen, manured, maunder, unarmed