Hello Richard,
What you could do is to edit the file /components/com_easyblog/themes/default/blog.item.php and remove the codes below:
<?php if( $row->isFeatured ) { ?>
<!-- Show a featured tag if the entry is featured -->
<sup class="tag-featured"><?php echo Jtext::_('COM_EASYBLOG_FEATURED_FEATURED'); ?></sup>
<?php } ?>