Anything that doesn’t work properly, or fails to come up to expectations; a dud.
A firework that has been wet and therefore fails to go off correctly.
An example or the act of disappointing: a circumstance in which a positive expectation is not achieved.
The feeling or state of being disappointed: a feeling of sadness or frustration when something is not as good as one hoped or expected, or when something bad unexpectedly happens.
Something or someone that disappoints: that which causes disappointment.