Feigningly refers to an action or behavior that is not genuine or sincere. Synonyms for feigningly include insincerely, pretentiously, falsely, affectedly, and artificially. Insincerely implies that someone is not being truthful or honest in their behavior or actions. Pretentiously suggests that someone is trying too hard to appear a certain way. Falsely implies that someone is deliberately deceiving or misleading others. Affectedly means that someone is acting in a way that is not natural to them. Artificially suggests that someone is putting on an act or performance. All of these synonyms can be used to describe someone who is behaving in a way that is not genuine or sincere.