Verb
demotivate (third-person singular simple present demotivates, present participle demotivating, simple past and past participle demotivated)
To decrease the motivation of a person or a group.
It can demotivate if it is perceived to be unfair, but base salary does not typically spur an employee to greatness. Source: Internet
If conducted poorly, performance reviews demotivate a workforce, create a negative dynamic between manager (the judge) and employee (the judged), and even lower productivity. Source: Internet