new WP_query utilizing customized fields

I’m making an attempt to question youngster posts from two mother and father (that half is working superb),

… however now I wish to exclude posts which have a meta_key of ‘characteristic’ with a meta_value of ‘1’

Utilizing the Codex reference I’ve tried a few methods to jot down this, not working.

Here is what I’ve written so far, I consider I am shut, however need assistance.
Thanks!

<?php
    $argsthis = array(
    'post_status' => 'publish',
    'post_type' => 'web page',
    'order' => 'DESC',
    'posts_per_page' => '5',
    'post_parent__in' => array(10,11),
    'meta_query' => array(
      array(
            'key'     => 'characteristic',
            'worth'   => '1',
            'evaluate' => '!=',
            ),
        )
    );
?>

and I’ve tried, merely (w very same consequence as above):

<?php
    $argsthis = array(
    'post_status' => 'publish',
    'post_type' => 'web page',
    'order' => 'DESC',
    'posts_per_page' => '5',
    'post_parent__in' => array(10,11),
    'meta_key'     => 'characteristic',
    'meta_value'   => '1',
    'meta_compare' => '!=',
            ),
        )
    );
?>