spiritless

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

• adjective Lacking energy or enthusiasm; listless.

from The Century Dictionary.

• Having no breath; extinct; dead.
• Having no spirit, vigor, courage, or fire; without one's customary vivacity; wanting cheerfulness; dejected; depressed.

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

• adjective Destitute of spirit; wanting animation; wanting cheerfulness; dejected; depressed.
• adjective Destitute of vigor; wanting life, courage, or fire.
• adjective Having no breath; extinct; dead.

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

• adjective Lacking energy, drive, motivation or emotion. Enervated.

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

• adjective evidencing little spirit or courage; overly submissive or compliant
• adjective lacking ardor or vigor or energy