(idiomatic, normally in the negative) Much better than one could ever expect.
1843, Calderón de la Barca, Life in Mexico:
At the same time, the Count de B—— very philanthropically hired an old discolored-looking horse, which was grazing peaceably outside the hut, and mounting the astonished quadruped, who had never, in his wildest dreams, calculated upon having so fine a chevalier on his back, galloped off in search of more solid food, while we set the Indian women to baking tortillas.
2022 August 10, Philip Haigh, “Scotland switched on to electrification”, in RAIL, number 963, page 35:
Those most rural routes will not get overhead wires. As Reeve told the seminar: "Even in my wildest dreams, I can't see a business case for electrifying the Far North Line."
