illimitable

being or seeming to be without limits the illimitable expanse of the universe Synonyms bottomless, boundless, endless, fathomless, horizonless, infinite, immeasurable, immensurable, indefinite, limitless, measureless, unbounded, unfathomable, unlimitedRelated Words abysmal; countless, incalculable, incomputable, inestimable, innumerable, unmeasured; exhaustless, inexhaustible; extensive, far-flung, immense, vastNear Antonyms fathomable, measurable; depthless, shallow, superficialAntonyms bounded, circumscribed, confined, definite, finite, limited, restricted