This meaning refers to something that lacks legal force, truth, or effectiveness. It is often used in contexts where documents, agreements, or actions are deemed unrecognized or without merit.

This meaning describes something that does not have the desired effect or is not producing the intended results. It can be used in a variety of contexts, especially in discussions about strategies, medications, or efforts that fail to achieve their goals.

This meaning conveys that an effort or action was made without success or did not lead to the intended outcome. It is often used to express regret or disappointment about wasted efforts.