Source : Webster's Revised Unabridged Dictionary (1913)

Timorous \Tim"or*ous\, a. [LL. timorosus, from L. timor fear;
   akin to timere to fear. See {Timid}.]
   1. Fearful of danger; timid; deficient in courage. --Shak.

   2. Indicating, or caused by, fear; as, timorous doubts. ``The
      timorous apostasy of chuchmen.'' --Milman. --
      {Tim"or*ous*ly}, adv. -- {Tim"or*ous*ness}, n.

Source : WordNet®

timorousness
     n 1: fear of the unknown or unfamiliar and of making decisions
          [syn: {timidity}, {timidness}]
     2: fearfulness in venturing into new and unknown places or
        activities [syn: {timidity}] [ant: {boldness}]