<p><strong>Adjective</strong></p><ul><li>in sufficient quantity;</li><li>in generous amounts (usually used following the noun it modifies):<ul><li>He had troubles aplenty.</li></ul></li></ul><p><strong>Adverb</strong></p><ul><li>sufficiently;</li><li>enough;</li><li>more than sparingly:<ul><li>He howled aplenty when hurt.</li></ul></li></ul>