Braindead (adjective)

1. Lacking in or having lost consciousness, vitality, or intelligence.
2. Extremely dull or lacking in energy.

Origin:

From brain + dead.

Examples:

1. He was braindead after being in a coma for a week.
2. The movie was so bad it was braindead.
3. The patient was declared braindead and the family decided to donate his organs.
4. The party was braindead and no one was having a good time.
5. He was braindead from the medication and couldn't focus on the task.