If this is trivial to you, what do you consider moderately difficult? What's sufficiently difficult that you have to spend a single day thinking about it? How a

If this is trivial to you, what do you consider moderately difficult? What's sufficiently difficult that you have to spend a single day thinking about it? How about an open problem requiring careful planning and months of effort? It's like the word "trivial" has no meaning anymore. All I can tell from people using it these days is that they're very confident in what they're about to say.