WordNet sense 1 (of verbs; having neither person nor number nor mood (as a participle or gerund or infinitive)):

non-finite

WordNet sense 2 (that cannot be entirely consumed or used up):

inexhaustible, unlimited

WordNet sense 3 (infinitely great in number):

endless

WordNet sense 4 (seemingly boundless in amount, number, degree, or especially extent):

boundless, limitless, unbounded

WordNet sense 5 (too numerous to be counted):

countless, innumerable, multitudinous, myriad, numberless, uncounted, unnumbered, innumerous, unnumberable, unnumerable

WordNet sense 6 (the unlimited expanse in which everything is located):

space

WordNet sense 7 (perfect or complete or pure):

absolute