logic A statement that contradicts itself.

Roget 519: unintelligibility; incomprehensibility, imperspicuity^†; inconceivableness, vagueness etc. adj.; obscurity; ambiguity etc. 520; doubtful meaning; uncertainty etc. 475; perplexity etc. (confusion) 59; spinosity^†; obscurum per obscurius [Lat.]; mystification etc. (concealment) 528; latency etc. 526; transcendentalism.    paradox, oxymoron; riddle, enigma, puzzle etc. (secret) 533; diagnus vindice nodus [Lat.]; sealed book; steganography^†, freemasonry.    pons asinorum [Lat.], asses' bridge; high Dutch, Greek, Hebrew; jargon etc. (unmeaning) 517.    ... show more

Roget 533: secret; dead secret, profound secret; arcanum^†, mystery; latency etc. 526; Asian mystery^†; sealed book, secrets of the prison house; le desous des cartes [Fr.].    enigma, riddle, puzzle, nut to crack, conundrum, charade, rebus, logogriph^†; monogram, anagram; Sphinx; crux criticorum [Lat.].    maze, labyrinth, Hyrcynian wood; intricacy, meander.    problem etc. (question) 461; paradox etc. (difficulty) 704; unintelligibility etc. 519; terra incognita etc. (ignorance) 491.    ... show more

Roget 704: difficulty; hardness etc. adj.; impracticability etc. (impossibility) 471; tough work, hard work, uphill work; hard task, Herculean task, Augean task^†; task of Sisyphus, Sisyphean labor, tough job, teaser, rasper^†, dead lift.    dilemma, embarrassment; deadlock; perplexity etc. (uncertainty) 475; intricacy; entanglement, complexity etc. 59; cross fire; awkwardness, delicacy, ticklish card to play, knot, Gordian knot, dignus vindice nodus [Lat.], net, meshes, maze; coil etc. (convolution) 248; crooked path; involvement.    nice point, delicate point, subtle point, knotty point; vexed question, vexata quaestio [Lat.], poser; puzzle etc. (riddle) 533; paradox; hard nut to crack, nut to crack; bone to pick, crux, pons asinorum [Lat.], where the shoe pinches.    nonplus, quandary, strait, pass, pinch, pretty pass, stress, brunt; critical situation, crisis; trial, rub, emergency, exigency, scramble.    scrape, hobble, slough, quagmire, hot water, hornet's nest; sea of troubles, peck of troubles; pretty kettle of fish; pickle, stew, imbroglio, mess, ado; false position.    set fast, stand, standstill; deadlock, dead set.    fix, horns of a dilemma, cul de sac [Fr.]; hitch; stumbling block etc. (hindrance) 706.    [difficult person] crab; curmudgeon.    ... show more

Roget 497: absurdity, absurdness etc. adj.; imbecility etc. 499; alogy^†, nonsense, utter nonsense; paradox, inconsistency; stultiloquy^†, stultiloquence^†; nugacity^†.    blunder, muddle, bull; Irishism^†, Hibernicism^†; slipslop^†; anticlimax, bathos; sophism etc. 477.    farce, galimathias^†, amphigouri^†, rhapsody; farrago etc. (disorder) 59; betise [Fr.]; extravagance, romance; sciamachy^†.    sell, pun, verbal quibble, macaronic^†.    jargon, fustian, twaddle, gibberish etc. (no meaning) 517; exaggeration etc. 549; moonshine, stuff; mare's nest, quibble, self-delusion.    vagary, tomfoolery, poppycock, mummery, monkey trick, boutade [Fr.], escapade.    ... show more

Dutch: tegenspraak, tegenstrijdigheid, antinomie, paradox
Polish: paradoksalność, paradoks