Is Boredom More Significant Than Other Emotions?
I won't exactly call that an academic quality resource but it is much better than the OP, which of course was nothing but your opinions on boredom.
"That seems to be a definition with an origin in there as well.. inability to engage in satisfying activity. Again, this has to do with attention, inability to focus, and lack of stimulating activity.. all basically what was mentioned or implicit in the OP."
Actually this is what you said in the OP, "Boredom is felt when one's attention is not focused on any particular task, or can originate from a lack of stimulating things to do."
And this is how John Eastwood of York University defines it in that article, "an aversive state of wanting, but being unable, to engage in satisfying activity"
No mention of "not focused on any particular task" or "a lack of stimulating things to do."
He instead is describing boredom as two conflicting states; a state of wanting and a state of not being satisfied. Further down in your article, the German psychologist Theodor Lipps, also seems to view it as a conflicting state of wanting and not being satisfied, but seems to be suggesting a state of both wanting an not wanting. A more in depth article could be very interesting.
"boredom is a baseline emotion"
In your article they say, " which springs from failures in one of the brain's attention networks." That says nothing about it being an emotion. You keep calling it an emotion, but you have not provided any supporting data for doing so.