enervate

weaken mentally or morally

“In the soft lap of refinement we have suffered the energetic powers to become enervate which those ages called into action and rendered indispensable.”

— Friedrich Schiller, The Works of Frederick Schiller

Priyanka thought karaoke would pep up her spirits in Osaka, but after hours of off-key singing and blaring lights, she felt more drained than when she started. "Who knew singing could enervate?" she mused, dragging herself home to silence and sleep.

Tariq sat by the Tagus River, his eyes fixed on the sunset's fading glow. As a lone sailboat drifted aimlessly with the tide, he felt an overwhelming sense of ennui wash over him; the day's relentless meetings had enervated his spirit, leaving him as listless as the boat.

“They are likely to "enervate" rather than "energize", according to Serge Hovnanian's model.”