When it comes to expressing disapproval, there are many synonyms for the phrase "severely criticize". Some commonly used alternatives include "rebuke", "reprimand", "chastise", and "scold". Each of these words implies a certain level of severity, with "rebuke" suggesting a strong verbal attack, "reprimand" implying a formal admonishment, "chastise" indicating a rebuke with punishment, and "scold" referring to a harsh reprimand given in an angry or indignant tone. Other synonyms for severe criticism include "condemn", "denounce", "censure", and "castigate". No matter which word you choose, the underlying sentiment is the same - a serious expression of disapproval or criticism.