invalid Antonyms

valid unerring sound solid situated sheer rigorous rightwise rightful right-angled right stoner strong surd unequivocal undubitable undoubted unappealable unalloyed true toft thoroughpaced thorough rhombus remissible point-device pistic persuasive perpendicularity permissible perfect patentee parenchyma orthodoxical orthodox positivist powerful reliable rectilineal reasonable real proper probatory predicable precise preceptive precedented orthodiagonal clever as a wagonload of monkeys positivistic