Intensity; harshness (8)
I believe the answer is:
severity
I believe this is a double definition.
'intensity' is the first definition.
(I know that severity is a type of intensity)
'harshness' is the second definition.
(I know that harshness can be written as severity)
(Other definitions for severity that I've seen before include "Harshness, asperity" , "Intensity; harshness" , "Sternness" .)