Here are some examples of how "demotivated" could be used:
* "I'm feeling demotivated about my job. I don't find it challenging anymore."
* "The team's demotivation was obvious after their losing streak."
* "The constant criticism was demotivating for the young artist."
Here are some other ways to say "demotivated":
* Discouraged
* Uninspired
* Unenthusiastic
* Lackadaisical
* Apathy
* Disheartened
* Burned out
Let me know if you'd like more examples or explanations!