languish

lose vigor, health, or flesh, as through grief

To become languid or weak; to lose strength or animation; to be or become dull, feeble or spiritless; to pine away; to wither or fade.

Lat. languere, to be weak

“The season bloomed scarce longer than a week for Hippias, and then began to languish.”

— George Meredith, Complete Project Gutenberg Works of George Meredith

“By May 2000, Smith and Mosier were still attached to produce with Talalay directing, but Smith did not know the status of Preacher, feeling it would languish in development hell.”