unadventurous (adj.)

• canny
• careful
• cautious
• circumspect
• deliberate
• discreet
• gingerly
• guarded
• heedful
• hesitant
• judicious
• mindful
• noncommittal
• pawky
• politic
• prudent
• regardful
• safe
• tentative
• thorough
• uncommunicative
• unenterprising