The Collaborative International Dictionary of English v.0.48:

Chaotic \Cha*ot"ic\ (k[asl]*[o^]t"[i^]k), a.
   Resembling chaos; confused.
   [1913 Webster]

WordNet (r) 3.0 (2006):

chaotic
    adj 1: lacking a visible order or organization [syn: chaotic,
           helter-skelter]
    2: completely unordered and unpredictable and confusing [syn:
       chaotic, disorderly]
    3: of or relating to a sensitive dependence on initial
       conditions

Moby Thesaurus II by Grady Ward, 1.0:

151 Moby Thesaurus words for "chaotic":
   aleatoric, aleatory, amorphic, amorphous, anarchial, anarchic,
   anarchistic, angry, antinomian, arsy-varsy, ass-backwards, baggy,
   balled up, balled-up, blobby, blurred, blurry, blustering,
   blusterous, blustery, bollixed up, bothered, broad, chance, chancy,
   characterless, clamorous, confused, discomposed, disconcerted,
   disordered, disorderly, disorganized, disturbed, embarrassed,
   featureless, flustered, fluttered, foggy, formless, fouled up,
   frantic, frenzied, furious, fussed, fuzzy, galley-west, general,
   haphazard, hazy, hectic, hellish, helter-skelter,
   higgledy-piggledy, hit-or-miss, hugger-mugger, ill-defined,
   imprecise, in a jumble, in a mess, in a pother, in a pucker,
   in a stew, in a sweat, in a swivet, in a tizzy, inaccurate,
   inchoate, incoherent, indecisive, indefinable, indefinite,
   indeterminable, indeterminate, indistinct, inexact, inform,
   infuriate, insensate, irregular, jumbled, kaleidoscopic, lax,
   loose, lumpen, mad, mindless, misty, mixed up, mixed-up, mucked up,
   muddled, nihilistic, noisy, nondescript, nonspecific, obscure,
   orderless, orgasmic, orgastic, pandemoniac, perplexed, perturbed,
   put-out, raging, random, rattled, ravening, raving, riotous,
   rip-roaring, ruffled, scattered, screwed up, shadowed forth,
   shadowy, shaken, shapeless, shook, shuffled, skimble-skamble,
   snafu, stochastic, storming, stormy, sweeping, syndicalistic,
   tempestuous, topsy-turvy, troublous, tumultuous, turbulent,
   unclear, undefined, undestined, undetermined, unmethodical,
   unordered, unorganized, unplain, unruly, unsettled, unspecified,
   unstuck, unsystematic, uproarious, upset, upside-down, vague,
   veiled, wild