What is another word for "improper"?

Roget's Thesaurus (1911) lists these synonyms for "improper": and, bad, barbarism, bias, bigotry, box, breach, break, bull, commit, cry, custom, ell, encroach, false, faulty, favor, favoritism, for, foul, give, grammar, grievance, has, head, heaven, illegal, immoral, impose, impropriety, inaccurate, inch, incongruous, incorrect, inequitable, iniquitous, iniquity, injurious, injustice, lamb.