What is another word for "solecistical"?

Roget's Thesaurus (1911) lists these synonyms for "solecistical": bad, barbarism, break, bull, commit, false, faulty, grammar, head, improper, impropriety, inaccurate, incongruous, incorrect, murder, pen, slip, slipslop, solecism, solecistic, solecize, the, tongue, use.