prizeless en · ADJ
Etymology
From prize + -less.
Meanings
-
(not-comparable) Without a prize.
Monty tells you that after you pick a door he will open a prizeless door from the remaining two, and that he will then give you the option of either staying with your original choice and getting a guaranteed bonus of $100 or switching to the one remaining unopened door without getting any bonus.
2009, Jason Rosenhouse, The Monty Hall problem: