able, ambiguous, amphibological, amphibolous, arcane, baffling, beguiling, bewildering, bothering, cabalistic, censored, classified, close, closed, concealed, confounding, confusing, cryptic, dark, discomposing, disconcerting, dismaying, distracting, disturbing, embarrassing, equivocal, equivocatory, esoteric, exceptional, extraordinary, fabulous, fantastic, fascinating, hermetic, hidden, hush-hush, incalculable, incognizable, incomprehensible, inconceivable, incredible, intricate, ironic, latent, marvelous, miraculous, multivocal, mysterious, mystifying, obscure, occult, outlandish, passing strange, perplexing, perturbing, phenomenal, polysemantic, polysemous, problematic, prodigious, puzzling, rare, remarkable, restricted, riddling, sealed, secret, sensational, smothered, sphinxlike, stifled, strange, striking, stupendous, suppressed, top secret, ulterior, unapparent, unapprehended, unascertained, unbeknown, unbreatheable, uncertain, uncharted, unclassified, under security, under wraps, undisclosable, undisclosed, undiscoverable, undiscovered, undivulgable, undivulged, unexplained, unexplored, unexposed, unfamiliar, unfathomed, unheard, unheard-of, unidentified, unimaginable, uninvestigated, unique, unknowable, unknown, unperceived, unplumbed, unprecedented, unrevealable, unrevealed, unspoken, unsuspected, untellable, untold, untouched, unutterable, unuttered, unwhisperable, upsetting, virgin, wonderful, wondrous
uncertainty, incertitude, doubt, doubtfulness, dubiety, dubitation, dubitancy, dubitousness, hesitation, suspense, perplexity, embarrassment, dilemma, bewilderment, timidity, vacillation, diaporesis, indetermination, vagueness, haze, fog, obscurity, ambiguity, contingency, dependence, dependency, double contingency, possibility upon a possibility, open question, onus probandi, blind bargain, pig in a poke, leap in the dark, something or other, needle in a haystack, needle in a bottle of hay, roving commission, precariousness, fallibility, uncertain, casual, random, changeable, doubtful, dubious, indecisive, unsettled, undecided, undetermined, in suspense, open to discussion, controvertible, in question, vague, indeterminate, indefinite, ambiguous, equivocal, undefined, undefinable, confused, mystic, oracular, dazed, perplexing, enigmatic
, paradoxical, apocryphal, problematical, hypothetical, experimental, unpredictable, unforeseeable (unknowable), fallible, questionable, precarious, slippery, ticklish, debatable, disputable, unreliable, untrustworthy, contingent, contingent on, dependent on, subject to, dependent on circumstances, occasional, provisional, unauthentic, unauthenticated, unauthoritative, unascertained, unconfirmed, undemonstrated, untold, uncounted, in a state of uncertainty, in a cloud, in a maze, bushed, off the track, ignorant, afraid to say, out of one's reckoning, astray, adrift, at sea, at fault, at a loss, at one's wit's end, at a nonplus, puzzled, lost, abroad, d_esorient_e, distracted, distraught, pendente lite, sub spe rati, Heaven knows, who can tell? who shall decide when doctors disagr.
unintelligibility, incomprehensibility, imperspicuity, inconceivableness, vagueness, obscurity, ambiguity, doubtful meaning, uncertainty, perplexity, spinosity, obscurum per obscurius, mystification, latency, transcendentalism, paradox, oxymoron, riddle, enigma, puzzle, diagnus vindice nodus, sealed book, steganography, freemasonry, pons asinorum, asses' bridge, high Dutch, Greek, Hebrew, jargon, unintelligible, unaccountable, undecipherable, undiscoverable, unknowable, unfathomable, incognizable, inexplicable, inscrutable, inapprehensible, incomprehensible, insolvable, insoluble, impenetrable, illegible, as Greek to one, unexplained, paradoxical, enigmatic
, enigmatical, puzzling (secret), indecipherable, obscure, dark, muddy, clear as mud, seen through a mist, dim, nebulous, shrouded in mystery, opaque, dense, undiscernible, misty, hidden, latent, indefinite, garbled, perplexed, undetermined, vague, loose, ambiguous, mysterious, mystic, mystical, acroamatic, acroamatical, metempirical, transcendental, occult, recondite, abstruse, crabbed, inconceivable, inconceptible, searchless, above comprehension, beyond comprehension, past comprehension, beyond one's depth, unconceived, inexpressible, undefinable, incommunicable, unpredictable, unforeseeable, it's Greek to me.