able, all-comprehensive, all-inclusive, boundless, countless, endless, enigmatic, eternal, exhaustless, extending everywhere, illimitable, illimited, immeasurable, immense, incalculable, incognizable, incomprehensible, inexhaustible, infinite, infinitely continuous, innumerable, interminable, interminate, limitless, measureless, mysterious, no end of, perpetual, puzzling, sealed, shoreless, strange, sumless, termless, unapparent, unapprehended, unascertained, unbeknown, unbounded, uncharted, uncircumscribed, unclassified, undisclosed, undiscoverable, undiscovered, undivulged, unexplained, unexplored, unexposed, unfamiliar, unfathomable, unfathomed, unheard, unheard-of, unidentified, uninvestigated, universal, unknowable, unknown, unlimited, unmeasurable, unmeasured, unnumbered, unperceived, unrevealed, unsuspected, untold, untouched, virgin, without bound, without end, without limit, without measure, without number