ignorance, nescience, tabula rasa, crass ignorance, ignorance crasse, unfamiliarity, unacquaintance, unconsciousness, darkness, blindness, incomprehension, inexperience, simplicity, unknown quantities, x, y, z, sealed book, terra incognita, virgin soil, unexplored ground, dark ages, smattering, sciolism, glimmering, dilettantism, bewilderment, incapacity, pedantry, charlatanry, charlatism, Philister, Philistine, ignorant, nescient, unknowing, unaware, unacquainted, unapprised, unapprized, unwitting, unweeting, unconscious, witless, weetless, a stranger to, unconversant, uninformed, uncultivated, unversed, uninstructed, untaught, uninitiated, untutored, unschooled, misguided, unenlightened, Philistine, behind the age, shallow, superficial, green, rude, empty, half-learned, illiterate, unread, uninformed, uneducated, unlearned, unlettered, unbookish, empty-headed, dizzy, wooly-headed, pedantic, in the dark, benighted, belated, blinded, blindfolded, hoodwinked, misinformed, au bout de son latin, at the end of his tether, at fault, at sea, caught tripping, unknown, unapprehended, unexplained
, unascertained, uninvestigated, unexplored, unheard of, not perceived, concealed, novel, ignorantly, unawares, for anything, for aught one knows, not that one knows, Int, God knows, Heaven knows, the Lord knows, who knows, nobody knows, ignorance never settles a question, quantum animis erroris inest!, small Latin and less Greek, that unlettered small-knowing soul, there is no darkness but ignorance.
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.
latency, implication, latency, inexpression, hidden meaning, occult meaning, occultness, mystery, cabala, anagoge, silence, concealment, more than meets the eye, more than meets the ear, Delphic oracle, le dessous des cartes, undercurrent, implication, logical implication, logical consequence, entailment, allusion, insinuation, innuendo, adumbration, something rotten in the state of Denmark, snake in the grass, secret, darkness, invisibility, imperceptibility, latent, lurking, secret, occult, implied, dormant, abeyant, unapparent, unknown, unseen, in the background, invisible, indiscoverable, dark, impenetrable, unspied, unsuspected, unsaid, unwritten, unpublished, unbreathed, untalked of, untold &c, unsung, unexposed, unproclaimed, undisclosed, unexpressed, not expressed, tacit, undeveloped, solved, unexplained
, untraced, undiscovered, untracked, unexplored, uninvented, indirect, crooked, inferential, by inference, by implication, implicit, constructive, allusive, covert, muffled, steganographic, understood, underhand, underground, delitescent, concealed, by a side wind, sub silentio, in the background, behind the scenes, behind one's back, on the tip of one's tongue, secretly, between the lines, thereby hangs a tale, tacitum vivit sub pectore vulnus, where there's smoke, there's fire.