WordNet (r) 3.0 (2006):

unexacting
    adj 1: not rigorous; "relaxed and unexacting standards"

Moby Thesaurus II by Grady Ward, 1.0:

43 Moby Thesaurus words for "unexacting":
   blanket, casual, flexible, general, imprudent, inaccurate,
   indiscreet, indiscriminate, indiscriminative, inexact, insensitive,
   nonjudgmental, pliant, promiscuous, tactless, unaustere,
   unconscientious, uncritical, uncriticizing, undemanding,
   undifferentiating, undiscreet, undiscriminating, undiscriminative,
   unfastidious, unfinical, unfussy, unharsh, unmeticulous,
   unpainstaking, unparticular, unprecise, unpunctilious, unpunctual,
   unrigorous, unscrupulous, unselective, unsevere, unstrict,
   unsubtle, untactful, wholesale, yielding