(a.) Not capable of being calculated; beyond calculation; very great.

able agnostic all-comprehensive all-inclusive ambiguous boundless capricious chancy changeable countless dicey doubting endless enigmatic equivocal erratic eternal exhaustless extending everywhere fickle hesitant hesitating illimitable illimited immeasurable immense incognizable incomprehensible indecisive indemonstrable inestimable inexhaustible infinite infinitely continuous innumerable interminable interminate irresolute limitless measureless mysterious no end of numberless perpetual polysemous puzzling sealed shoreless skeptical strange sumless surreptitiously termless touch-and-go unaccountable unapparent unapprehended unascertained unbeknown unbounded uncertain uncharted uncircumscribed unclassified unconfirmable unconvinced uncountable uncounted undisclosed undiscoverable undiscovered undivinable undivulged unexplained unexplored unexposed unfamiliar unfathomable unfathomed unforeseeable unheard unheard-of unidentified uninvestigated universal unknowable unknown unlimited unmeasurable unmeasured unnumbered unperceived unpersuaded unplumbed unpredictable unprovable unrevealed unsure unsuspected untold untouched unverifiable variable virgin wavering whimsical without bound without end without limit without measure without number