Roget's Thesaurus: Entry 105 (Infinity)

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#105. Infinity. -- N. infinity, infinitude, infiniteness &c. adj.; perpetuity &c. 112; boundlessness. V. be infinite &c. adj.; know no limits, have no limits, know no bounds,have no bounds; go on for ever.

Adj. infinite; immense; numberless, countless, sumless[obs], measureless; innumerable, immeasurable, incalculable, illimitable, inexhaustible, interminable, unfathomable, unapproachable; exhaustless, indefinite; without number, without measure, without limit, without end; incomprehensible; limitless, endless, boundless, termless[obs]; untold, unnumbered, unmeasured, unbounded, unlimited; illimited[obs]; perpetual &c. 112.

Adv. infinitely &c. adj.; ad infinitum.

Phr. "as boundless as the sea" [Romeo and Juliet].