The word "panegyrical" refers to praise or admiration, but if we're looking for antonyms, we would want words that convey the opposite meaning. Some options might include "critical," "derogatory," "insulting," or "condemning." Other antonyms might include "disapproving," "unsupportive," "faultfinding," or "detracting." Essentially, any words that imply a negative or unpleasant view of someone or something could be considered antonyms for "more panegyrical." Of course, the best word to use will depend largely on the context, tone, and intended meaning of the statement.