overcautious

from WordNet (r) 3.0 (2006)

overcautious
    adj 1: unnecessarily cautious; "sometimes it doesn't pay to be
           overcautious in business"

from The Collaborative International Dictionary of English v.0.48

Overcautious \O"ver*cau"tious\, a.
   Too cautious; cautious or prudent to excess. --
   {O"ver*cau"tious*ly}, adv. -- {O"ver*cau"tious*ness}, n.
   [1913 Webster]