WordNet sense 1 (a wanderer who has no established residence or visible means of support):

drifter, floater, vagrant

WordNet sense 2 (wandering aimlessly without ties to a place or community):

rootless

WordNet sense 3 (continually changing especially as from one abode or occupation to another):

aimless, floating, drifting

WordNet sense 4 (not settled or established):

unsettled

WordNet sense 5 (move about aimlessly or without any destination, often in search of food or employment):

cast, drift, ramble, range, roam, roll, rove, stray, swan, tramp, wander