From The Collaborative International Dictionary of English v.0.48 :
chickenhearted \chickenhearted\, Chicken-hearted \Chick"en-heart`ed\, a. Timid; fearful; cowardly; easily frightened. --Bunyan. [1913 Webster]From WordNet (r) 3.0 (2006) :
chickenhearted adj 1: easily frightened [syn: chicken, chickenhearted, lily-livered, white-livered, yellow, yellow- bellied]