Antonym of motivated

The antonym (opposite) of motivated is unmotivated.

Motivated means eager to work hard and be successful. 
Unmotivated means not eager to work hard and be successful, or, having no desire to succeed at something.

Here are example sentences with these words:

1. She is highly motivated and works harder than anyone else.
2. He seems unmotivated. He comes to work late, and he doesn’t seem interested in learning new skills.