gutless

from WordNet (r) 3.0 (2006)

gutless
    adj 1: lacking courage or vitality; "he was a yellow gutless
           worm"; "a spineless craven fellow" [ant: {gutsy},
           {plucky}]
    2: weak in willpower, courage or vitality [syn: {namby-pamby},
       {gutless}, {spineless}, {wishy-washy}]

from The Collaborative International Dictionary of English v.0.48

gutless \gut"less\ adj.
   lacking courage or vitality; as, he was a yellow gutless
   worm. Opposite of {gutsy}.

   Syn: spineless.
        [WordNet 1.5]

from Moby Thesaurus II by Grady Ward, 1.0

63 Moby Thesaurus words for "gutless":
      anemic, asthenic, bloodless, chicken, coward, cowardly, craven,
      debilitated, drooping, droopy, dull, effete, etiolated, faint,
      faintish, feeble, flabby, flaccid, floppy, gone, gritless,
      heartless, imbecile, impotent, languid, languorous, lily-livered,
      limber, limp, listless, lustless, marrowless, nerveless, pithless,
      pluckless, poltroonish, pooped, powerless, pusillanimous, rubbery,
      sapless, sinewless, slack, soft, spineless, spiritless, spunkless,
      strengthless, uncourageous, undaring, ungallant, unhardened,
      unheroic, unintrepid, unmanly, unnerved, unsoldierlike,
      unsoldierly, unstrung, unvaliant, unvalorous, weak, weakly