From the Latin for "wander," vagrant should be used as a romantic adjective for "undecided"; "vague," a close etymological relative, should remain a pejorative. If a synonym for "bum" is required, use "vagabond" instead, please. See: MIND-WANDERING.
A wanderer that shows up in unexpected places. Several species of hummingbirds native to the southwestern United States appear as vagrants in the eastern U.S., especially in late fall and early winter.