Sluggish (adjective)

1. Slow to respond or move; lethargic.
2. Lacking energy or enthusiasm; dull.

Origin:

From the middle english word "sluggisch" meaning "lazy, slow-moving".

Examples:

1. The sluggish economy was a concern for the government.
2. The sluggish stream was barely moving.
3. He felt sluggish after eating too much.
4. She was sluggish after the long flight.
5. The sluggish computer was causing delays.