Nugatory
1. Trifling, of no value or importance, worthless.
2. Of no force, invalid; useless, futile, of no avail, inoperative.
From the Latin nūgātōrius, past participle stem of nūgārī, to trifle. The word was first used in 1603 in a translation of Plutarch. Perhaps slightly surprisingly the word appears to have no connexion to nougat.