I feel like I know this word/phrase (may not necessarily be English, but it would be a common borrowed term) on the tip of my tongue but I can't seem to recall it.
It has a feeling/tone like "expected disappointment". Not quite "disheartening", nor "disenchanting" but along those lines.
The sentence I plan to use it in relates to where our solar system is placed in the galaxy - the revelation that we live on one of the smaller inconspicuous minor spiral arms of our milky way instead of a major one.
The wider historical context stems from our past belief that we are something special to the universe; the Sun, planets and the stars revolve around us. But as we progress in science, we discover that Earth moves around the Sun, that our star, the Sun, is only one of many in the Milky Way, and that our Milky Way, is only one of a set of extremely common galaxies, etc.
It's a little bit _____ to know that we live in one of the minor spiral arms - that in reality, we really aren't that special after all.