[kidgorgeous]

Find a new gig.

[altdataseller]

There will be disengaged workers no matter what company you work for (with a few exceptions like perhaps NASA) so your best bet is to learn how to work with them instead

[flashback2199]

I agree, however, if the disengaged coworker(s) and OP's consequent lack of motivation are both symptoms of the work itself, finding a new gig could lead to more satisfying work.

[VFIT7CTO77TOC]

Lawyer up! Delete facebook! Hit the gym!

[keikobadthebad]

Asking OP to get stuff done with people in that state, does not make it sound like the company are setting you up for success. If the company are also responsible for how they ended up like that, finding a new gig sounds like a good solution.