Synonyms and related words :
all-comprehensive, all-inclusive, arcane, at issue, boundless, cabalistic, censored, classified, close, closed, concealed, conditional, conditioned, contingent, countless, cryptic, dark, dependent, depending, endless, enigmatic, enormous, esoteric, eternal, exhaustless, extending everywhere, gigantic, hermetic, hidden, hush-hush, illimitable, illimited, immeasurable, immense, in question, in suspense, in the balance, incalculable, incomprehensible, inconceivable, indescribable, inexhaustible, inexpressible, infinite, infinitely continuous, innumerable, interminable, interminate, latent, limitless, mammoth, measureless, mighty, monstrous, myriad, mysterious, no end of, numberless, occult, open, pendent, pending, perpetual, private, prodigious, restricted, secret, shoreless, silent, smothered, stifled, sumless, suppressed, suspenseful, termless, titanic, top secret, ulterior, unbounded, unbreatheable, uncircumscribed, uncountable, uncounted, undecided, undeclared, under security, under wraps, undetermined, undisclosable, undisclosed, undivulgable, undivulged, unestablished, unexpressed, unfathomable, unfixed, unimaginable, universal, unlimited, unmeasurable, unmeasured, unmentioned, unnumbered, unplumbed, unproclaimed, unpronounced, unpublished, unrecorded, unreported, unrevealable, unrevealed, unsaid, unsettled, unspeakable, unspoken, unsung, untalked-of, untellable, unthinkable, unutterable, unuttered, unvoiced, unwhisperable, unwritten, up for grabs, vast, without bound, without end, without limit, without measure, without number, wordless