like a clam

attentive careful considerate intelligent noncommittal prudent reasonable restrained tactful thoughtful watchful

alert awake cagey calculating chary circumspect civil conservative controlled diplomatic discerning discriminating gingerly guarded having foresight heedful judicious moderate not rash observant on lookout politic precautious reserved safe sagacious strategic temperate vigilant wary wise worldly-wise

careless heedless idiotic inattentive incautious inconsiderate negligent stupid thoughtless unmindful unthoughtful

foolish indiscreet rash reckless uncareful undiscerning