How can I sort a query by a special order?

I need a query like this:

select * from orderingtest order by rankingstring against sortlist(highest, 
higher, high, aboveaverage, average, belowaverage, low, lower, lowest, '', 
NULL)

the structure might be something like this:

create table orderingtest
(
  id bigint unsigned not null auto_increment primary,
  rankingstring varchar(255)
);

insert into orderingtest set rankingstring='highest';
insert into orderingtest set rankingstring='high';
insert into orderingtest set rankingstring='aboveaverage';
insert into orderingtest set rankingstring='average';
insert into orderingtest set rankingstring='belowaverage';
insert into orderingtest set rankingstring='low';
insert into orderingtest set rankingstring='lowest';
insert into orderingtest set rankingstring='high';
insert into orderingtest set rankingstring='high';
insert into orderingtest set rankingstring='low';
insert into orderingtest set rankingstring='low';
insert into orderingtest set rankingstring='average';
insert into orderingtest set rankingstring='belowaverage';
insert into orderingtest set rankingstring='higher';
insert into orderingtest set rankingstring='aboveaverage';
insert into orderingtest set rankingstring='lower';

I cannot use temporary tables or views and I cannot change the structure 
(this sorting is far dynamic and customizable)

Any Ideas? 



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