Unnecessarily cautious.

Roget 864: cautious, wary, guarded; on one's guard etc. (watchful) 459; cavendo tutus [Lat.]; in medio tutissimus [Lat.]; vigilant.    careful, heedful; cautelous^†, stealthy, chary, shy of, circumspect, prudent, discreet, politic; sure-footed etc. (skillful) 698.    unenterprising, unadventurous, cool, steady, self-possessed; overcautious.    ... show more