- "The general standard of this homework was abysmal. Most of you would have failed had this been your examination. I expect to see a great deal more effort for this week's essay on the various varieties of venom antidotes, or I shall have to start handing out detentions to those dunces who get D’s."
- —Severus Snape.[src]
Dreadful is one of the three failing grades, out of six grades overall, in the Ordinary Wizarding Levels, Nastily Exhausting Wizarding Tests, and Wizards' Ordinary Magic and Basic Aptitude Tests. It is the second lowest mark, immediately below 'Poor' and immediately above 'Troll'.
Advancing to N.E.W.T.-level