When it comes to finding synonyms for the phrase "be damning," there are plenty of options to choose from. Some possible alternatives include "condemn," "censure," "reprobate," "denounce," and "castigate." All of these words convey a sense of strong disapproval or judgment against something or someone. Other options might include "criticize harshly," "demonize," "rebuke," or "vilify." Depending on the context in which you are using this phrase, certain synonyms may be more appropriate than others. Ultimately, the key is to choose a word that accurately reflects the intensity and severity of your judgment or condemnation.