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]WordNet (r) 3.0 (2006):
overcautious adj 1: unnecessarily cautious; "sometimes it doesn't pay to be overcautious in business"