<p>An <a href="https://www.thoughtco.com/italian-adjectives-4063126" data-component="link" data-source="inlineLink" data-type="internalLink" data-ordinal="1">adjective</a> is a word that qualifies a <a href="https://www.thoughtco.com/italian-nouns-gender-and-number-4058574" data-component="link" data-source="inlineLink" data-type="internalLink" data-ordinal="2">noun</a>; for example, a <em>good</em> boy. In Italian an adjective agrees in gender and number with the noun it modifies. In Italian there are two groups of adjectives: those ending in <strong>-o</strong> and those ending in <strong>-e</strong>.</p><p>Adjectives ending in <em>-o</em> in the masculine have four forms:</p><table><thead><tr><th> </th><th>Maschile</th><th>Femminile</th></tr></thead><tbody><tr><td>Singolare</td><td><strong><em>-o</em></strong></td><td><strong><em>-a</em></strong></td></tr><tr><td>Plurale</td><td><strong><em>-i</em></strong></td><td><strong><em>-e</em></strong></td></tr><tr><td> </td><td>il libr<strong><em>o</em></strong> italian<strong><em>o</em></strong></td><td>la signor<strong><em>a</em></strong> italian<strong><em>a</em></strong></td></tr><tr><td> </td><td>i libr<strong><em>i</em></strong> italian<strong><em>i</em></strong></td><td>le signor<strong><em>e</em></strong> italian<strong><em>e</em></strong></td></tr><tr><td> </td><td>il prim<strong><em>o</em></strong> giorn<strong><em>o</em></strong></td><td>la mens<strong><em>a</em></strong> universitari<strong><em>a</em></strong></td></tr><tr><td> </td><td>i prim<strong><em>i</em></strong> giorn<strong><em>i</em></strong></td><td>le mens<strong><em>e</em></strong> universitari<strong><em>e</em></strong></td></tr></tbody></table><p>If an adjective ends in <strong><em>-io</em></strong>, the <strong>o</strong> is dropped to form the plural.</p><p><em>l&#39;abito vecchi<strong>o</strong></em> (the old suit)<br/><em>gli abiti vecch<strong>i</strong></em> (the old suits)<br/><em>il ragazzo seri<strong>o</strong></em> (the serious boys)<br/><em>i ragazzi ser<strong>i</strong></em> (the serious boys)</p><p><em>Uli è tedesco.</em> (Uli is German.)<br/><em>Adriana è italiana.</em> (Adriana is Italian.)<br/><em>Roberto e Daniele sono americani.</em> (Robert and Daniel are American.)<br/><em>Svetlana e Natalia sono russe.</em> (Svetlana and Natalia are Russian.)</p><p>Adjectives ending in <strong>-e</strong> are the same for the masculine and the feminine singular. In the plural, the <strong>-e</strong> changes to <em>-i</em>.</p><p>il ragazz<strong>o</strong> ingles<strong>e</strong> (the English boy)<br/>la ragazz<strong>a</strong> ingles<strong>e</strong> (the English girl)<br/>i ragazz<strong>i</strong> ingles<strong>i</strong> (the English boys)<br/>le ragazz<strong>e</strong> ingles<strong>i</strong> (the English girls)</p><p>An adjective modifying two nouns of different gender is masculine.</p><p><em>i padri e le madre italian<strong>i</strong></em> (Italian fathers and mothers)</p>