nightmarish, adj. 1. disquieting, disturbing, frightening, frightful, fear-inspiring, Inf. scary; alarming, startling, dismaying, astounding, appalling; kaf-kaesque, terrifying, terror-inspiring, terror-fraught, horrible, horrid, horrific, awful; dire, fell, dreadful, ghastly, grim, appalling, shocking, creepy; petrifying, harrowing, rending, racking; excruciating, agonizing; odious, execrable, repulsive, forbidding, abhorrent, enough to drive one mad.
2. exasperating, annoying, irritating, provoking, mortifying, galling; plaguing, bothering, bothersome, harassing; worrying, worrisome, tormenting, haunting.
nighttime, n. night, dead of night, wee hours. See - night (def. 1). nightwalker, n. 1. noctambulist, noctambule, sleepwalker, somnambulist, somnambulator.
2. thief, burglar, housebreaker, robber; Inf. second-story man, cat burglar, sneak thief, prowler; SI. cracksman, safecracker, picklock, Raffles.
3. prostitute, whore, harlot, lady of the evening; woman of the profession, woman of ill-repute, woman of the streets, streetwalker, bar girl, call girl, Cyprian; hussy, slut, demimondaine, loose woman, wanton, tramp; SI. chippy, Fr. fille de joie, trollop, strumpet; All SI. cat, tart, hustler, bim, bimbo, hooker, floozie, working girl.
nihilism, n. 1. total rejection, renunciation, abnegation, denial; skepticism, nullifidianism, floccinau-cinihilipilification; agnosticism, disbelief, atheism, nonbelief; cynicism, pessimism, negativism, malism.
2. nonexistence, nothingness, nihility, nullity, negativeness, existencelessness; unreality, unactuality, nonreality, nonlife, nonoccurence, Fr. n6ant, nullibicity, inexistence, nonsubsistence, incorporeity, incorporeality, inessentiality; nonentity, nonbeing, unbeing; oblivion, negation, blank, void, vacuity, vacuum, emptiness, abeyance, nothing.
3. terrorism, anarchy, lawlessness, antinomianism, syndicalism, anarcho-syndicalism; Bakuninism, Chartism, subversion, kulakism; sedition, mutiny, insubordination; traitorousness, treason, disloyalty, perfidy; destructiveness, violence, revolutionism; disorder, misrule, unruliness, chaos, turmoil; mob rule, mobocracy, ochlocracy, lynch law, license.
nihilist, n. 1. anarchist, reactionary, extremist, absurdist, syndicalist, antinomian, Bakuninist; terrorist, revolutionary, counter-revolutionary, insurrectionist, insurgent, agitator; seditionist, traitor, insubordinate, mutineer, rebel, revolter, secessionist; iconoclast, wrecker, destroyer, sansculotte; factionary, protestor, marcher, demonstrator; troublemaker, rabble-rouser, tub-thumper, demagogue, firebrand, mob-orator.
2. skeptic, agnostic, doubter, doubting Thomas, nullifidian; cynic, pessimist, malist, SI. gloomy Gus.
nihilistic, adj. 1. anarchistic, anarchic, lawless, antinomian, syndicalistic; rebellious, mutinous, riotous, insurrectionary, incendiary, sansculottic; treasonous, traitorous, insubordinate, subversive; revolutionary, revolutionist, counter-revolutionary, reactionary; unruly, disorderly, chaotic, disorganized; destructive, demolitionary, ravaging, vandalic.
2. cynical, pessimistic, negative, negativistic, defeatist, gloomy.
nihility, n. nothingness, nonexistence, nullity. See - nihilism (def 2).
nil, n. 1. nothing, naught, zero, none; cipher, aught, SI. goose egg, SI. zip, SI. zilch, SI. the big O, Cricket SI. duck, Tennis, love.