pigeonhearted

from The Collaborative International Dictionary of English v.0.48

Pigeon-hearted \Pi"geon-heart`ed\, a.
   Timid; easily frightened; chicken-hearted. --Beau. & Fl.
   [1913 Webster]

from Moby Thesaurus II by Grady Ward, 1.0

36 Moby Thesaurus words for "pigeonhearted":
      afraid, chicken, chickenhearted, coward, cowardly, cowed, daunted,
      dismayed, fainthearted, fearful, funking, funky, henhearted,
      intimidated, lily-livered, milk-livered, milksoppish, milksoppy,
      mousy, overtimid, overtimorous, panic-prone, panicky, rabbity,
      sissified, sissy, soft, timid, timorous, unmanly, unmanned, weak,
      weak-kneed, weakhearted, white-livered, yellow