"thoroughly bad" is a correct and usable phrase in written English.
You can use it to emphasize how bad something is. For example, "It was a thoroughly bad decision to hit him."
This dossier is a thoroughly bad idea.
"It's a thoroughly bad thing to have men-only leadership".
A thoroughly bad character, Ellsworth nevertheless prompted widespread imitation.
(It is true that Palmer thought the Reform Act of 1832 was a thoroughly bad thing).
Jesper Andersson, while a thoroughly bad egg, is not the Truth Terrorist.
"Can a film be brilliantly made but thoroughly bad?" asked The Guardian, answering a resounding yes to its own question.
"Thoroughly bad-bad-bad," he called the pain.
But that's the strangeness of "Hero," which pledges allegiance to two theatrical styles, the commercial musical and agitprop drama, with its impeccably decent good guys and thoroughly evil bad guys.
(Daniel M. Gold) 'Hero: The Musical' (closes on Saturday) This South Korean musical about the freedom fighter An Chunggun (it was made to commemorate the 100th anniversary of his death) pledges allegiance to two theatrical styles, the commercial musical and agitprop drama, with its impeccably decent good guys and thoroughly evil bad guys.
I had been brought up to believe that he was one of the worst bigots in the world, the heir to the Black and Tans (whose wickedness my nan had told me about), thoroughly mad and bad.
If you're stuck, take a nap, go to bed, you'll more thoroughly purge the bad idea you're stuck on, and you'll be more attuned to clues that might solve the problems.
