Seriously bad (6)
I believe the answer is:
severe
(Other definitions for severe that I've seen before include "Harsh and stringent" , "Extreme - strict" , "'Strict, harsh (6)'" , "Stern, austere" , "Harsh and unbending" .)
I believe the answer is:
severe
(Other definitions for severe that I've seen before include "Harsh and stringent" , "Extreme - strict" , "'Strict, harsh (6)'" , "Stern, austere" , "Harsh and unbending" .)