The “restless frustration” mentioned upthread is a great descriptor - I suppose that can also be termed boredom, per the definition you provide. Except I’d call that frustration and not boredom. IOW, why on earth would anyone watch a film or read a book for the fifth time if they didn’t want to?
I always thought “boredom” means…not knowing what you want to do, and furthermore, not being interesting in doing something, anything; not being able to come up with something to do (or a satisfying state of simply being). Essentially wanting to be entertained, or looking for external stimuli?
My business (I’m a painting contractor) definitely involves a whole lot of rote and repetitive, and not mentally-stimulating, behaviour. But I either listen to NPR while I work, or chat with people around me, or get lost in my thoughts while I’m working. I never feel restless, or as if I could be doing something else more worthwhile, or frustrated. When I’m not working, I’m either doing active/social things, reading, or (like now!) piddling around online, which I find quite enjoyable.
It’s sort of like what delphica describes with conference calls. When I used to be a developer, most of my day could be spent engaged in writing and testing code. Now that I am a program manager, I don’t really “do” anything. I mean I have tasks I do, but not stuff that commands my intellectual abilities. I just sort of sit in front of my computer watching emails and conference call invites come in from all over the world. Then I respond or sit on those calls. Later, I fill out some status updates and send them off to someone who I assume doesn’t read them.
Painting the bathroom in my condo is more engaging. Heck, watching the paint dry afterwards is more engaging.
That sounds…boring! Heh.
Lots of jokes about watching paint dry (and missing a spot, and gun control, etc) in my trade. But I enjoy the creativity and the fact that each job offers up a different set of people, colours, finishes, locations, challenges. I enjoy what I do and am never bored at work.