Looks like they are hard-coded into the sidebar. So you could manually remove them, but they’ll just return when you update the theme.
Best solution would be to make a child theme, if possible, and create a new sidebar without the unwanted widgets.
EDIT:
Remove
<aside id="archives" class="widget">
<h1 class="widget-title"><?php _e( 'Archives', 'adamos' ); ?></h1>
<ul>
<?php wp_get_archives( array( 'type' => 'monthly' ) ); ?>
</ul>
</aside>
<aside id="meta" class="widget">
<h1 class="widget-title"><?php _e( 'Meta', 'adamos' ); ?></h1>
<ul>
<?php wp_register(); ?>
<li><?php wp_loginout(); ?></li>
<?php wp_meta(); ?>
</ul>
</aside>
That should be sufficient.
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