When a person is resettled, they've uprooted their lives from one place and settled, or made their homes, in a completely new one — often in an entirely different country. You can also use this adjective for non-human animals that have changed habitats: "Though the birds usually build their nests in the city park, we saw some resettled birds over near the river." Settle comes from the Old English setlan, "cause to sit," from setl, "a seat."