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