WordPress at a glance
action is not described

wp_login_failed action-hook . WP 2.5.0

Fires after a user login has failed.

Usage

add_action( 'wp_login_failed', 'action_function_name_2640' );
function action_function_name_2640( $username ){
	// action...
}
$username(string)
Username or email address.

Changelog

Since 2.5.0 Introduced.
Since 4.5.0 The value of $username can now be an email address.

Where the hook is called

wp_authenticate()
wp_login_failed
wp-includes/pluggable.php 558
do_action( 'wp_login_failed', $username );

Where the hook is used (in WP core)

Usage not found!