WordNet sense 1 (a river in southwestern Alabama; flows into Mobile Bay):

mobile, Mobile River

WordNet sense 2 ((of groups of people) tending to travel and change settlements frequently):

nomadic, peregrine, roving, wandering

WordNet sense 3 (not settled or established):

unsettled

WordNet sense 4 (in motion):

moving

WordNet sense 5 (able to move freely in all directions):

versatile

WordNet sense 6 (capable of being moved or conveyed from one place to another):

movable

WordNet sense 7 (affording change (especially in social status)):

fluid

WordNet sense 8 (such that alteration is possible; having a marked tendency to change):

changeable, changeful