The Collaborative International Dictionary of English v.0.48:

Timidity \Ti*mid"i*ty\, n. [L. timiditas: cf. F. timidit['e].]
   The quality or state of being timid; timorousness; timidness.
   [1913 Webster]

WordNet (r) 3.0 (2006):

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