"Histrionically" refers to an excessively theatrical or dramatic way of behaving or speaking. There are several synonyms for this word, such as melodramatically, theatrically, extravagantly, dramatically, overzealously, flamboyantly, showily, ostentatiously, and grandiosely. Each of these words emphasizes the same emphasis on exaggerated behavior, but they are used in different contexts. When describing someone who is putting on an overly theatrical show, "melodramatically" or "theatrically" would be more appropriate. For someone who is behaving in an overly grandiose or exaggerated fashion, "grandiosely" or "ostentatiously" would be better suited. Regardless of the context, each of these synonyms paints a picture of exaggerated behavior brought forth by theatricality.