Final answer:
A censure is an expression of strong disapproval. It carries a critical tone from disappointed to angry or bitter, and best fits the sentence provided by the question.
Step-by-step explanation:
A censure is a rebuke or expression of strong criticism and disapproval. It can often be critical and direct, carrying a tone that may range from disappointed to angry or bitter. It is not to be confused with more positive or neutral terms such as candid, which denotes frankness or straightforwardness in manner. In choosing between the provided options, 'censure' aptly fills the blank and conveys the intended meaning of a strong expression of disapproval.