If "vegetate" means to live a dull, inactive life:
* Lounge: This implies relaxation and lack of activity.
* Idly: This emphasizes the lack of purpose.
* Slouch: This has a more physical connotation, emphasizing a lack of energy.
* Drowse: This emphasizes sleepiness or lack of alertness.
If "vegetate" means to grow or develop slowly:
* Wither: This implies a slow decline or decay.
* Stagnate: This emphasizes a lack of progress or movement.
* Lag: This is a more neutral term for slow growth.
If "vegetate" means to be inactive or oblivious:
* Zone out: This suggests a lack of awareness or focus.
* Space out: This is similar to "zone out" but with a more detached feeling.
* Drift: This emphasizes a lack of direction or purpose.
It's important to consider the specific context of the sentence when choosing the best synonym. What is the overall feeling you want to convey?