- The definition of crestfallen is being very disappointed or depressed.
A child whose long-awaited birthday party has just been cancelled is an example of someone who would be described as crestfallen.
- with drooping crest or bowed head
- dejected, disheartened, or humbled
Dispirited and depressed; dejected.
(comparative more crestfallen, superlative most crestfallen)