"Poniarding" is a rather uncommon word that refers to the act of stabbing someone with a small dagger or knife. When it comes to synonyms for this act, there are several options to choose from. For instance, "stabbing" is a simple and straightforward term that describes the same action. "Impaling" is another synonym that is often used in a more graphic and intense context than "stabbing." "Thrusting" is also a good synonym, as it implies a forceful action similar to a poniard. Finally, "jabbing" is a synonym that suggests a quick and sudden action, which is apt for describing a poniard attack. Overall, each synonym effectively conveys the same image and connotation as "poniarding".