Cautious

careful wary alert watchful vigilant prudent discreet circumspect heedful guarded chary judicious shrewd safe considerate forethoughtful calculating leery on the lookout watching out heedful gingerly tentative thinking twice watching one’s step keeping on one’s toes all ears taking it slow taking it easy playing safe politic provident pussyfoot cagey walking on eggs with one’s eyes peeled hedging one’s bets playing it cool