Lassitude, languor (8)
I believe the answer is:
lethargy
This clue is a double definition.
'lassitude' is the first definition.
(I know that lassitude can be written as lethargy)
'languor' is the second definition.
(I know that languor can be written as lethargy)
(Other definitions for lethargy that I've seen before include "Sloth" , "Lack of energy and enthusiasm" , "state of apathy" , "Lassitude, sluggishness" , "Inertia" .)