cautious
cau.tious \'ko.-sh*s\ aj : marked by or given to caution he exercise of forethought usu. prompted by fear of probable or even of merely possible danger; CIRCUMSPECT suggests less fear and stresses the surveying of all possible consequences before acting or deciding; WARY emphasizes suspiciousness and alertness in watching for danger and cunning in escaping it; CHARY implies a cautious reluctance to give, act, or speak freely - cau.tious.ly av SYN syn CIRCUMSPECT, WARY, CHARY: CAUTIOUS implies t
Webster's English Dictionary