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 reliable pistic persuasive perpendicularity permissible perfect patentee parenchyma orthodoxical orthodox orthodiagonal point-device positivist rectilineal reasonable real proper probatory predicable precise preceptive precedented powerful officinal clever as a wagonload of monkeys