<p><strong>Preposition:</strong></p><ul><li>Against</li></ul><p><strong>Against:</strong></p><ul><li>In opposition to.</li><li>In contrast to.</li><li>Consider the problems of the teenager contra those of the adult.</li></ul><p><strong>Adverb:</strong></p><ul><li>Contrariwise</li></ul><p><strong>Contrariwise:</strong></p><ul><li>On or to the contrary.</li><li>In an opposite manner or direction.</li></ul>