Roget's Thesaurus of English Words and Phrases by Peter Mark Roget

nonentity, nil; negativeness &c adj.; nullity; nihility†, nihilism; tabula rasa [Lat.], blank; abeyance; absence &c 187; no such thing &c 4; nonbeing, nothingness, oblivion. annihilation; extinction &c (destruction) 162; extinguishment, extirpation, Nirvana, obliteration. V. not exist &c 1; have no existence &c 1; be null and void; cease to exist &c 1; pass away, perish; be extinct, become extinct &c adj.; die out; disappear &c 449; melt away, dissolve, leave not a rack behind; go, be no more; die &c 360. annihilate, render null, nullify; abrogate &c 756; destroy &c 162; take away; remove &c (displace) 185; obliterate, extirpate. Adj. inexistent†, nonexistent &c 1; negative, blank; missing, omitted; absent &c 187; insubstantial, shadowy, spectral, visionary. unreal, potential, virtual; baseless, in nubibus [Lat.]; unsubstantial &c 4; vain. unborn, uncreated†, unbegotten, unconceived, unproduced, unmade. perished, annihilated, &c v.; extinct, exhausted, gone, lost, vanished, departed, gone with the wind; defunct &c (dead) 360. fabulous, ideal &c (imaginary) 515, supposititious &c 514. Adv. negatively, virtually &c adj.. Phr. non ens [Lat.].