Synonyms and related words :
Greek to one, abstruse, all-comprehensive, all-inclusive, ambiguous, antic, arcane, baffling, beguiling, bewildering, beyond understanding, boundless, countless, cryptic, dark, deep, endless, enigmatic, eternal, exceptional, exhaustless, extending everywhere, extraordinary, fabulous, fanciful, fantastic, fascinating, illimitable, illimited, immeasurable, immense, impenetrable, impossible, inarticulate, incalculable, incognizable, incoherent, inconceivable, incredible, indecipherable, inexhaustible, infinite, infinitely continuous, innumerable, inscrutable, interminable, interminate, limitless, marvelous, measureless, miraculous, mysterious, mystifying, no end of, numinous, obscure, occult, opaque, outlandish, passing strange, past comprehension, perpetual, perplexing, phenomenal, prodigious, puzzling, rambling, rare, recondite, remarkable, sensational, shoreless, strange, striking, stupendous, sumless, termless, unaccountable, unbelievable, unbounded, uncircumscribed, unconnected, undecipherable, unexpected, unfathomable, unheard-of, unimaginable, unintelligible, unique, universal, unknowable, unlimited, unmeasurable, unmeasured, unnumbered, unplumbed, unprecedented, unsearchable, untold, without bound, without end, without limit, without measure, without number, wonderful, wondrous