What is a real word that means "disenthused"?
Solution 1:
You may use dispirit:
Cause (someone) to lose enthusiasm or hope: (ODO)
- the army was dispirited by the uncomfortable winter conditions
or disappoint:
- fail to satisfy the hope, desire, or expectation of. (AHD)
- I was dispirited / disappointed by what I saw.
Solution 2:
Unenthused is a real word, at least in British English.
http://www.oxforddictionaries.com/definition/english/unenthused