lack energy in English:

I feel listless and have a throbbing headache.

The heat made us all feel listless.

I've been sluggish recently.

In view of sluggish growth of economy there is not much enthusiasm in the financial markets.

I'm always sluggish in the morning

He is a sluggish student.

Mr. Smith ran his sluggish horse along the country roads.

... cortex will be more sluggish.

The service in that Chinese buffet was really sluggish

sluggish service

A heavy lunch makes me sluggish in the afternoon

Thereafter the story became more sluggish

He felt very heavy and sluggish after the meal.

I see them being sluggish, even for skaa.

Economic recovery has so far been sluggish.

He is a sluggish worker. I want him out of the company.

The president wants to jump-start the sluggish economy by lowering taxes.