cautious

(noun) people who are fearful and cautious. Synonyms: timid. Example: "Whitewater rafting is not for the timid."

(adj) showing careful forethought. Synonyms: cautious (vs. incautious). Examples: "Reserved and cautious; never making swift decisions." "A cautious driver."

(adj) avoiding excess. Synonyms: conservative. Example: "A conservative estimate."