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

For further exploring for "gutless" in Webster Dictionary Online

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