nugatory

1. (law) Having no force, inoperative, ineffectual.Examples: "But these regulations would have been impotent and nugatory, had not the licentious nobles been awed by the sword of the civil power."; "The word "necessary" is considered as controlling the whole sentence, and as limiting the right to pass laws for the execution of the granted powers to such as are indispensable, and without which the power would be nugatory."; "He protested against the Fugitive Slave Law as necessarily nugatory and utterly impossible of execution because unanimously condemned by the public sentiment of the North."

2. (computing) Removable from a computer program with safety, but harmless if retained.