To inadvertantly place trust in something turning out a certain way, but finding out later the trust was based on a false pretense. Different from unexpected because it was a total screw-up, not just a surprise.
by mycbrad July 13, 2009
To have the incorrect perception of what the outcome of a situation should be due to missing the main idea or key points defining the situation.
The overlord has serious misexpectations for the play, he thought it was a comedy beforehand when it was actually mystery.
by Vocabulomorph September 6, 2015