Arrierepensee is a French word that means a hidden or ulterior motive. It is often used to describe a thought or intention that is not openly expressed but lies behind someone's words or actions. Some synonyms for arrierepensee include hidden agenda, underlying motive, subtext, hidden purpose, and undisclosed intention. Another related term is subterfuge, which refers to the use of deceit or deception to achieve a goal. Understanding the nuances of these words can be helpful in navigating interpersonal relationships or discerning the true motivations of others.