WordNet (r) 3.0 (2006):

unsubtle
    adj 1: lacking subtlety; obvious; "gave us a broad hint that it
           was time to leave" [syn: broad, unsubtle]

Moby Thesaurus II by Grady Ward, 1.0:

25 Moby Thesaurus words for "unsubtle":
   blanket, casual, general, imprudent, indiscreet, indiscriminate,
   indiscriminative, insensitive, nonjudgmental, promiscuous,
   tactless, uncritical, uncriticizing, undemanding,
   undifferentiating, undiscreet, undiscriminating, undiscriminative,
   unexacting, unfastidious, unmeticulous, unparticular, unselective,
   untactful, wholesale