The Collaborative International Dictionary of English v.0.48:

Unlimited \Un*lim"it*ed\, a.
   1. Not limited; having no bounds; boundless; as, an unlimited
      expanse of ocean.
      [1913 Webster]

   2. Undefined; indefinite; not bounded by proper exceptions;
      as, unlimited terms. "Nothing doth more prevail than
      unlimited generalities." --Hooker.
      [1913 Webster]

   3. Unconfined; not restrained; unrestricted.
      [1913 Webster]

            Ascribe not unto God such an unlimited exercise of
            mercy as may destroy his justice.     --Rogers.
      [1913 Webster]

   Unlimited problem (Math.), a problem which is capable of an
      infinite number of solutions.

   Unlimited pump, a kind of deep-well pump placed at the
      level of the water, and operated from above ground.
      [1913 Webster] -- Un*lim"it*ed*ly, adv. --
      Un*lim"it*ed*ness, n.
      [1913 Webster]

WordNet (r) 3.0 (2006):

unlimited
    adj 1: having no limits in range or scope; "to start with a
           theory of unlimited freedom is to end up with unlimited
           despotism"- Philip Rahv; "the limitless reaches of outer
           space" [syn: unlimited, limitless] [ant: limited]
    2: without reservation or exception [syn: outright, straight-
       out, unlimited]
    3: that cannot be entirely consumed or used up; "an
       inexhaustible supply of coal" [syn: inexhaustible,
       unlimited]

Moby Thesaurus II by Grady Ward, 1.0:

174 Moby Thesaurus words for "unlimited":
   absolute, admitting no exception, all-comprehensive, all-inclusive,
   all-knowing, all-out, all-powerful, all-seeing, all-wise, almighty,
   bibulous, boundless, categorical, changeless, clear, complete,
   conclusive, countless, crapulent, crapulous, creating, creative,
   decided, decisive, definite, definitive, determinate, downright,
   endless, entire, eternal, eternally the same, everlasting,
   excessive, exhaustless, explicit, express, extending everywhere,
   extensive, extravagant, extreme, far-reaching, final, fixed, flat,
   flat-out, full, full-blown, full-scale, global, glorious,
   gluttonous, good, hallowed, highest, holy, illimitable, illimited,
   immeasurable, immense, immoderate, immortal, immutable, implicit,
   inappealable, incalculable, incomprehensible, incontinent,
   indefinite, indisputable, indulgent, inexhaustible, infinite,
   infinitely continuous, innumerable, inordinate, intemperate,
   interminable, interminate, just, limitless, loving, luminous,
   majestic, making, measureless, merciful, myriad, never-ending,
   no end of, no strings, numberless, numinous, omnipotent,
   omnipresent, omniscient, one, open, out-and-out, outright,
   overindulgent, overindulging, peremptory, perfect, permanent,
   perpetual, plenary, plenipotentiary, positive, prodigal, radiant,
   round, sacred, self-indulgent, shaping, shoreless, sovereign,
   straight, straight-out, sumless, supreme, swinish, termless,
   timeless, too much, total, totalitarian, ubiquitous, unbound,
   unbounded, unbridled, unchanging, unchecked, uncircumscribed,
   unconditional, unconditioned, unconfined, unconstrained,
   uncontrolled, undefined, undisciplined, undoubting, unequivocal,
   unfathomable, unfrugal, unhampered, unhesitating, universal,
   unmeasurable, unmeasured, unmistakable, unmitigated, unnumbered,
   unplumbed, unqualified, unquestioning, unreserved, unrestrained,
   unrestricted, unthrifty, untold, unwaivable, utter, vast, whole,
   wide-open, without bound, without end, without exception,
   without limit, without measure, without number, without reserve,
   without strings