The Collaborative International Dictionary of English v.0.48:

Repetitive \Re*pet"i*tive\ (r?-p?t"?-t?v), a.
   Containing repetition; repeating. [R.]
   [1913 Webster]

WordNet (r) 3.0 (2006):

repetitive
    adj 1: repetitive and persistent; "the bluejay's insistent cry"
           [syn: insistent, repetitive]
    2: characterized by repetition; "repetitive movement" [syn:
       repetitive, repetitious] [ant: nonrepetitive]

Moby Thesaurus II by Grady Ward, 1.0:

109 Moby Thesaurus words for "repetitive":
   abundant, articulated, automatic, battological, beaten, boring,
   catenated, ceaseless, concatenated, connected, constant, continual,
   continued, continuing, continuous, copious, cyclical, diffuse,
   diffusive, direct, drab, duplicative, echoic, echoing, effusive,
   endless, extravagant, exuberant, featureless, fecund, formless,
   frequent, gapless, gray, gushing, gushy, habitual, hackneyed,
   humdrum, imitative, immediate, incessant, interminable, iterative,
   joined, jointless, linked, monotonous, never-ending, nonstop,
   overflowing, parrotlike, perennial, periodic, persistent,
   pleonastic, prodigal, productive, profuse, profusive, prolific,
   recapitulative, recurrent, recurring, redundant, reduplicative,
   reechoing, regular, reiterant, reiterative, relentless, repeated,
   repeating, repetitional, repetitionary, repetitious,
   round-the-clock, routine, running, same, samely, seamless, serried,
   smooth, stable, steady, stereotyped, straight, superabundant,
   tautological, tautologous, tedious, teeming, trite,
   twenty-four-hour, unbroken, unceasing, undifferentiated, unending,
   uniform, unintermitted, unintermittent, unintermitting,
   uninterrupted, unrelieved, unremitting, unstopped, well-trodden,
   well-worn