absence, absence of mind, blank, blankness, broom, brush, brush off, clean slate, deprivation, emptiness, empty-headedness, empty space, hollowness, inanity, jejunity, mental void, negation, negativeness, negativity, nihility, nonbeing, nonentity, nonexistence, nonoccurrence, nonreality, nonsubsistence, not-being, nothing, nothingness, nullity, sweep, sweep out, sweep up, tabula rasa, unactuality, unreality, vacancy, vacuity, vacuousness, vacuum-clean, vapidity, void, whisk