When it comes to describing a performance, the phrase "outrageous theatricality" can convey a sense of over-the-top drama and flamboyance. If you're looking for synonyms to use instead, consider words like "dramatic excess," "theatrical flamboyance," or "over-the-top theatrics." Other options might include terms like "grandiloquence," "ostentatiousness," or "exaggerated showmanship." Depending on the context, you might also explore words like "bombast," "melodrama," or "histrionics" as possible alternatives. Keep in mind that the right synonym will depend on the tone and message you're trying to convey, so choose carefully.