vegetate

To grow or sprout as a plant does.

To grow pathologically on a body part, as a wartlike lesion on a heart valve.

To exist in a state of physical or mental inactivity.

To engage in relaxing or passive activities, such as watching television.

To grow over or cover with vegetation.

In pathology, to grow in the form of an excrescence.

Same as sprout, 5.

To grow in the manner of plants; fulfil vegetable functions.

Hence To live an idle, unthinking, useless life; have a mere inactive physical existence; live on without material or intellectual achievement.