Milquetoast, baby, big baby, blank cartridge, butt, castrato, chicken, chicken liver, coward, crybaby, doormat, drip, dud, dull tool, eunuch, faintly, fence-sitter, fraid-cat, fraidy-cat, funk, funker, gelding, gutless wonder, impotent, incompetent, invalid, invertebrate, jellyfish, lightweight, lily liver, mark, meek soul, milksop, misfit, mollycoddle, mouse, mugwump, namby-pamby, nebbish, nonentity, pansy, pantywaist, pushover, sad sack, scaredy-cat, shilly-shally, shrinking violet, sissy, softling, softy, sop, sotto voce, sucker, waverer, weak sister, weakly, white feather, white liver, wobbler