1) (something caused by) a drifting movement (drift)
(of ships, boats) under control, not tied or anchored
floating out of control
floating; carried along on air or water
floating
that flies, flutters or waves
in the air, winged
a sentence or phrase within another sentence, marked off by commas, dashes or brackets; round brackets () for this
digression
a poor person having no fixed home
unsettled; vagrant