Vegetate (verb)

To lead a passive, inactive, or dull life; to exist in a monotonous state.

Origin:

Late 16th century: from latin vegetat- "animated, enlivened", from the verb vegetare, from vegetus "lively, active". .

Examples:

1. He spent most of his days vegetating in front of the TV.
2. After the accident, she was forced to vegetate in a hospital bed.
3. The prisoners were made to vegetate in their cells for months.
4. He was too depressed to do anything but vegetate in his room.
5. The plant was just vegetating and not producing any flowers.