Untold

Adjective

 * 1) Not told; not related; not revealed.
 * 2) Not numbered or counted.

Thesaurus
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universal, unlimited, unmeasurable, unmeasured, unmentioned, unnumbered, unplumbed, unproclaimed, unpronounced, unpublished, unrecorded, unreported, unrevealable, unrevealed, unsaid, unsettled, unspeakable, unspoken, unsung, untalked-of, untellable, unthinkable, unutterable,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

Etymology
From unteald:, from tellan: