(n.) A state of not being committed or pledged; forbearance or refusal to commit one's self. Also used adjectively.

canny careful cautious circumspect constrained cool deliberate discreet gingerly guarded heedful hesitant incommunicable judicious leaving out nothing mindful on guard overlooking no possibility pawky politic precautional precautionary precautious prudent regardful reserved restrained safe slow to act tentative thorough unadventurous uncommunicative undaring unenterprising unprecipitate wary watchful