The Collaborative International Dictionary of English v.0.48:

Unrestrained \Unrestrained\
   See restrained.

WordNet (r) 3.0 (2006):

unrestrained
    adj 1: not subject to restraint; "unrestrained laughter" [ant:
           restrained]
    2: marked by uncontrolled excitement or emotion; "a crowd of
       delirious baseball fans"; "something frantic in their
       gaiety"; "a mad whirl of pleasure" [syn: delirious,
       excited, frantic, mad, unrestrained]

Moby Thesaurus II by Grady Ward, 1.0:

274 Moby Thesaurus words for "unrestrained":
   a bit much, abandoned, ablaze, accessible, adrift, afire, afloat,
   alternating, amorphous, approachable, ardent, artless, bibulous,
   bluff, blunt, boiling over, boundless, breathless, broad, brusque,
   burning, candid, capricious, careless, changeable, changeful,
   communicative, conversable, cordial, crapulent, crapulous,
   delirious, demonstrative, desultory, deviable, direct, disobedient,
   dizzy, downright, drunk, easy, easygoing, eccentric, effusive,
   egregious, enormous, enthusiastic, erratic, exaggerated, excessive,
   excited, exorbitant, expansive, explicit, extravagant, extreme,
   extroverted, exuberant, fabulous, fancy, fast and loose, febrile,
   fervent, fervid, fevered, feverish, fickle, fiery, fitful, flaming,
   flickering, flighty, flitting, fluctuating, flushed, forthright,
   frank, frankhearted, freakish, free, free-speaking, free-spoken,
   free-tongued, genuine, giddy, gigantic, glowing, gluttonous, go-go,
   gossipy, headstrong, heady, heart-to-heart, hearty, heated, high,
   hot, hyperbolic, hypertrophied, immoderate, impassioned, impetuous,
   impotent, imprecise, impulsive, inconsistent, inconstant,
   incontinent, indecisive, indifferent, indulgent, infirm, ingenuous,
   inordinate, insubordinate, intemperate, intense, intoxicated,
   irregular, irrepressible, irresolute, irresponsible, keen, lawless,
   lax, lenient, licentious, lively, loose, mazy, mercurial,
   monstrous, moody, mutinous, negligent, newsy, nonrestrictive,
   on fire, open, openhearted, orgiastic, out of bounds,
   out of control, out of hand, out of sight, outgoing, outrageous,
   outspoken, overbig, overdeveloped, overgreat, overgrown,
   overindulgent, overindulging, overlarge, overmuch, overpermissive,
   overweening, passionate, permissive, plain, plain-spoken,
   plainspoken, prodigal, rambling, rampant, red-hot, reinless,
   relaxed, remiss, restless, riotous, round, roving, scatterbrained,
   self-indulgent, self-revealing, self-revelatory, self-willed,
   shapeless, shifting, shifty, shuffling, sincere, slack, slipshod,
   sloppy, sociable, soft, spasmodic, spineless, steaming, steamy,
   steep, stiff, straight, straight-out, straightforward, swinish,
   talkative, too much, transparent, unaccountable, unbridled,
   uncertain, unchecked, uncoerced, uncompelled, unconfined,
   unconscionable, unconstrained, uncontinent, uncontrolled, uncurbed,
   undependable, undisciplined, undue, unequivocal, unfixed, unforced,
   unfrugal, ungoverned, unguarded, unhampered, uninhibited,
   unlimited, unmastered, unmeasured, unmuzzled, unpredictable,
   unreasonable, unreined, unreliable, unrepressed, unreserved,
   unrestricted, unrestrictive, unreticent, unruly, unsecretive,
   unsettled, unshrinking, unsilent, unstable, unstable as water,
   unstaid, unsteadfast, unsteady, unsubdued, unsuppressed,
   untempered, unthrifty, untrammeled, vacillating, vagrant, variable,
   vicissitudinary, vicissitudinous, vigorous, volatile, wandering,
   wanton, warm, wavering, wavery, wavy, wayward, weak, whimsical,
   wild, wildcat, willful, wishy-washy, zealous