lacking courage

dastardly

afraid anxious apprehensive backward base chicken-hearted cowering cowhearted craven diffident dismayed fainthearted frightened gutless having the willies jittery lily-livered nervous no guts panicky pigeonhearted pusillanimous recreant retiring running scared scared shrinking shy soft spineless timid timorous weak weak-kneed worthless yellow yellow-bellied

bold brave courageous daring dauntless unafraid undaunted unfearful