sluggish

from The American Heritage® Dictionary of the English Language, 5th Edition.

• adjective Displaying little movement or activity; slow; inactive.
• adjective Lacking alertness, vigor, or energy; inert or indolent.
• adjective Slow to perform or respond to stimulation.

from The Century Dictionary.

• Slow; having or giving evidence of little motion: as, a sluggish stream.
• Idle and lazy, habitually or temporarily; indolent; slothful; dull; inactive.
• Inert; inactive; torpid.
• Dull; tame; stupid.
• Synonyms Lazy, Slothful, etc. (see idle); slack, supine, phlegmatic, apathetic.

from the GNU version of the Collaborative International Dictionary of English.

• adjective Habitually idle and lazy; slothful; dull; inactive.
• adjective Slow; having little motion.
• adjective Having no power to move one's self or itself; inert.
• adjective rare Characteristic of a sluggard; dull; stupid; tame; simple.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• adjective Habitually idle and lazy; slothful; dull; inactive; as, a sluggish man.
• adjective Slow; having little motion; as, a sluggish stream.
• adjective Having no power to move one's self or itself; inert.
• adjective Characteristic of a sluggard; dull; stupid; tame; simple.
• adjective Exhibiting economic decline, inactivity, slow or subnormal growth.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• adjective (of business) not active or brisk
• adjective moving slowly
• adjective slow and apathetic