Adjective afloat has 3 senses
  1. adrift, afloat, aimless, directionless, planless, rudderless, undirected - aimlessly drifting
    Antonym: purposeful (indirect, via purposeless)
  2. afloat - borne on the water; floating
    aground, beached, high-and-dry, shipwrecked, stranded, sunken, submerged, drowned, swamped
  3. afloat, awash, flooded, inundated, overflowing - covered with water; "the main deck was afloat (or awash)"; "the monsoon left the whole place awash"; "a flooded bathroom"; "inundated farmlands"; "an overflowing tub"
    Antonym: empty (indirect, via full)