adj. Describing a plant (or by extension something else) that does not have roots.
adj. A wanderer, someone who has no ties to a particular locale.
the GNU version of the Collaborative International Dictionary of English
adj. Destitute of roots.
The Century Dictionary and Cyclopedia
Having no root.
In zoology, having a persistently open pulp-cavity and growing perennially, as the incisor teeth of rodents, and the molar teeth of many of these animals; not rooted so as to stop growing. See Rodentia.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
adj. wandering aimlessly without ties to a place or community
Word Usage
"It doesn't seem like a mistake that Mike himself is apparently "rootless"--a traveler, wanderer, lone wolf--and it is women of a similar nomadic lifestyle who finally do him in."