WordNet (r) 3.0 (2006):

overindulgent
    adj 1: excessively indulgent

Moby Thesaurus II by Grady Ward, 1.0:

61 Moby Thesaurus words for "overindulgent":
   accommodating, affable, agreeable, amiable, benevolent, benign,
   benignant, bibulous, careless, complaisant, compliant, crapulent,
   crapulous, decent, easy, easygoing, excessive, extravagant,
   extreme, generous, gluttonous, gracious, immoderate, impotent,
   imprecise, incontinent, indifferent, indulgent, inordinate,
   intemperate, kind, kindly, lax, lenient, loose, negligent,
   obliging, overindulging, overpermissive, permissive, prodigal,
   relaxed, remiss, self-indulgent, slack, slipshod, sloppy, soft,
   swinish, too much, unbridled, unconstrained, uncontrolled,
   undisciplined, unfrugal, unlimited, unmeasured, unrestrained,
   untempered, unthrifty, weak