Yes. I'm experiencing that right now. Especially the boredom and a little frustration, but because I want a mentally-stimulating activity and nothing sounds good.

I'm not very good on terminology, but the literal definition (unable to feel pleasure) seems to fit what you describe? I guess the bigger question is, are your feelings pathological (in this case I mean related to brain chemistry) or situational? If you break down the descriptions of your mood even further, what do you find, if anything?

Thinking about my situation, I wonder if my boredom is coming from being stuck on a novel I started working on during a hypomanic phase. When I came down from that good mood, I started to feel inadequate (depression talking, maybe). Feelings of inadequacy led to me thinking my novel might actually be stupid. Now I am possibly afraid to keep working on it because I might scrap it altogether?

The reason I think it's possible is that what keeps repeating in my head is "I should work on my novel." When the word should comes up instead of want to, I think it's significant. My perspective has changed from one of enjoyment to one of obligation, even though the obligation is self-assigned. Then, when I think of other activities, I may be dismissing them because of self-assigned guilt over not wanting to work on my possibly-stupid novel.

So to bring it back to you, would it help to look a little deeper into those feelings of boredom and frustration? Is there a thought that is occurring to you that you might be shoving away due to other more specific feelings?

It might not be, and your feelings of apathy would nonetheless be valid, but it's just some food for thought.