I'm looking for a word to describe when everything is exactly wrong. "Imperfect" isn't what I'm looking for, as it can be used when some things are right and other things are wrong.
For example, suppose I'm predicting that a series of coin flips will all be heads:
- If every coin is a head, I was 100% correct and have made a perfect prediction.
- If some coins are heads and some coins are tails, I was neither 100% nor 0% correct and have made an imperfect prediction.
- If every coin is a tail, I was 0% correct and have made a _______ prediction.