There are several synonyms for the word "improperation" that can help convey its meaning in a variety of contexts. One synonym is "vituperation", which refers to a verbal attack or strong criticism aimed at someone. Another similar word is "censure", which signifies the expression of strong disapproval or harsh judgment. "Reproach" is yet another synonym that captures the act of expressing disappointment or disapproval towards someone's behavior or actions. Lastly, "condemnation" can also serve as a synonym for "improperation" and indicates the act of reproving or finding fault with someone. These synonyms provide alternatives to effectively communicate the idea of admonishing or criticizing someone's actions.