I had to look them up in the dictionary but this about says it.
ennui –noun - a feeling of utter weariness and discontent resulting from satiety or lack of interest; boredom; a feeling of listlessness and general dissatisfaction resulting from lack of activity or excitement
angst –noun, - a feeling of dread, anxiety, or anguish.
anhedonia - lack of pleasure or of the capacity to experience it. Absence of pleasure from the performance of acts that would normally be pleasurable.
torpor - noun - 1. sluggish inactivity or inertia. 2. lethargic indifference;
apathy – noun, 1. absence or suppression of passion, emotion, or excitement. 2. lack of interest in or concern for things that others find moving or exciting.