– Definition: adj. marked by lack of definite plan, regularity, or purpose
– Used in a sentence: Except for my relatively brief writing career, my life has been a desultory yet full one.
– Why: I think it characterizes much of our post-Y2K (remember that?) popular culture. In the late 1990s, we had a nice fin-de-siecle sort of desperation. But ever since the Great Odometer rolled over, meh.