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