It means that you are not happy with someone's behavior or with what they did.
Crestfallen means dejected or disappointed
The adjective dejected means unhappy, disappointed, or depressed because of failure or an undesirable outcome.
There are many ways one might use the term 'crestfallen.' The definition of the word 'crestfallen' means for one to feel sad or disappointed. Crestfallen could also be used to replace dejected.
Both "disappointed by" and "disappointed with" are correct structures. Use "disappointed by" when referring to the cause of disappointment, and "disappointed with" when referring to the person or thing that caused the disappointment.
The person was very disappointed when he did not get the lottery. It is an example sentence for disappointed.
Force = Mass * Acceleration. It may be considered a definition of force.
more disappointed
She felt disappointed when she didn't receive the promotion she had been working hard for.
The answer depends on the definition of F.
funnel cloud
A psychologist is someone who studies behaviour.
The Yiddish word for disappointed is "Ahntoisht".