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]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]