title: Wordpress. Get posts without featured image only
body: <p>I know we can filter posts <strong>with</strong> a featured image by using</p>
  
  <pre><code>'meta_query' =&gt; array(
      array( 'key' =&gt; '_thumbnail_id'), 
  )
  </code></pre>
  
  <p>in <a href="https://developer.wordpress.org/reference/classes/wp_query/" rel="nofollow noreferrer"><code>WP_Query()</code></a></p>
  
  <p>But how do I get posts <strong>without</strong> featured image?</p>