(a.) Incapable of being measured; indefinitely extensive; vast\.

Gargantuan all-comprehensive all-inclusive amplitudinous astronomical awesome boundless bulky colossal cosmic countless endless enormous eternal exhaustless extending everywhere extensive galactic gigantic great huge illimitable illimited immense incalculable incomprehensible indefinite inestimable inexhaustible infinite infinitely continuous innumerable interminable interminate king-size large limitless mammoth massive massy measureless monster monstrous monumental mountainous no end of numberless outsize overgrown perpetual prodigious shoreless sizable spacious stupendous sumless termless titanic tremendous unbounded uncircumscribed uncountable uncounted unfathomable universal unlimited unmeasurable unmeasured unnumbered unplumbed untold vast voluminous weighty without bound without end without limit without measure without number