Source : Webster's Revised Unabridged Dictionary (1913)

Fainthearted \Faint"*heart`ed\, a.
   Wanting in courage; depressed by fear; easily discouraged or
   frightened; cowardly; timorous; dejected.

         Fear not, neither be faint-hearted.      --Is. vii. 4.
   -- {Faint"*heart`ed*ly}, adv. -- {Faint"*heart`ed*ness}, n.

Source : WordNet®

faintheartedness
     n : the trait of lacking boldness and courage [ant: {stoutheartedness}]