caution

(noun) the trait of being cautious; being attentive to possible danger. Synonyms: cautiousness, carefulness. Example: "A man of caution."

(noun) a warning against certain acts. Synonyms: caveat. Example: "A caveat against unfair practices."

(noun) judiciousness in avoiding harm or danger. Synonyms: precaution, care, forethought. Examples: "He exercised caution in opening the door." "He handled the vase with care."

(noun) the trait of being circumspect and prudent. Synonyms: circumspection.

(verb) warn strongly; put on guard. Synonyms: admonish, monish.