Synonyms for Cautious (same or very similar meaning)
WordNet sense 1 (people who are fearful and cautious):
timidWordNet sense 2 (avoiding excess):
conservativeWordNet sense 3 (with extreme care or delicacy):
gingerlyWordNet sense 4 (exercising caution or showing care or attention):
carefulFrom the ODE community, based on WordNetadd/edit