Boredom, dissatisfaction (5)
I believe the answer is:
ennui
I believe this clue is a double definition.
'boredom' is the first definition.
(synonyms)
'dissatisfaction' is the second definition.
(ennui is a kind of dissatisfaction)
(Other definitions for ennui that I've seen before include "Boredom, tedium" , "Weary feeling" , "Feeling of weariness or boredom" , "to make one list less when connected" , "Boredom, listlessness" .)