Which word means to reproach or reprove sharply?

The word "upbraid" is an excellent choice for describing a sharp reproach or reproof. It conveys a sense of a stern critique, often involving a strong expression of disapproval. This term carries connotations of scolding or reprimanding someone for their actions or behavior, which aligns well with the context of reproaching someone.

In a broader sense, words like "admonish," "castigate," and "rebuke" also relate to expressing disapproval, but they can carry slightly different nuances. "Admonish" typically implies a warning or counsel against behaviors, while "castigate" often suggests a more severe form of punishment or condemnation. "Rebuke" similarly means to express sharp disapproval or criticism but may not fully capture the same intensity as "upbraid." Therefore, "upbraid" is the word that most closely matches the description of reproaching or reproving sharply.