Roget's Thesaurus: Entry 568 (Solecism)

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#568. Solecism. -- N. solecism; bad grammar, false grammar, faulty grammar; slip of the pen, slip of the tongue; lapsus linguae[Lat]; slipslop[obs]; bull; barbarism, impropriety.

V. use bad grammar, faulty grammar; solecize[obs], commit a solecism; murder the King's English, murder the Queen's English, break Priscian's head.

Adj. ungrammatical; incorrect, inaccurate; faulty; improper, incongruous; solecistic, solecistical[obs].