When it's necessary to reprimand someone for their behavior, it's important to use language that makes the severity of the situation clear. Some synonyms for admonishing severely might include rebuke, reprove, scold, chastise, caution, or warn. Each of these words implies a strong level of disapproval or dissatisfaction, and may be useful depending on the context in which the situation is occurring. Other phrases that could replace admonish severely might involve more specific language about the negative effects of someone's actions, such as "call out" or "criticize sharply." No matter which synonym is chosen, it's important to communicate effectively and make clear the seriousness of the situation at hand.