How often will the list of ajdectives change? If it is something that changes often you might want to store them in your database so that you can update the list without re-deploying code. If you make a model of adjectives and store them in the database you can use sequel pro or some other database GUI to update the list without having to create an admin area with CRUD operations to make changes to the list.
Alternatively, if they rarely change you could keep it the way you have it or store them in a configuration file and use the config helper to retrieve them:
$adjectives = config('data.listOfAdjectives');
I think it really comes down to how often changes will be made to the list.