noncommittal (adj.)

• canny
• careful
• cautious
• circumspect
• constrained
• cool
• deliberate
• discreet
• gingerly
• guarded
• heedful
• hesitant
• judicious
• mindful
• pawky
• politic
• precautional
• precautionary
• prudent
• regardful
• reserved
• restrained
• safe
• tentative
• thorough
• unadventurous
• uncommunicative
• unenterprising
• wary
• watchful