[1] : The Collaborative International Dictionary of English v.0.48

lackluster \lack"lus`ter\, lacklustre \lack"lus`tre\, n.
   a lack of luster.
   1913 webster lackluster

[2] : The Collaborative International Dictionary of English v.0.48

lackluster \lack"lus`ter\, lacklustre \lack"lus`tre\ a.
   1. wanting luster or brightness. "lackluster eye." --shak.
      1913 webster

   2. lacking spirit, liveliness, or enthusiasm; dull.
      pjc

   3. mediocre; as, a lackluster performance.
      pjc

[3] : WordNet (r) 2.0

lacklustre
     adj 1: lacking brilliance or vitality; "a dull lackluster life"; "a
            lusterless performance" syn: lackluster, lusterless,
             lustreless
     2: lacking luster or shine; "staring with lackluster eyes";
        "lusterless hair" syn: lackluster, lusterless, lustreless
see also:
lackluster lusterless lustreless 

[4] : Moby Thesaurus II by Grady Ward, 1.0

24 moby thesaurus words for "lacklustre":
   blah, bland, boring, colorless, dense, dingy, dismal, drab, dreary,
   dull, flat, insipid, prosaic, slow, tedious, thick, tiresome,
   two-dimensional, unexciting, unimaginative, uninteresting, vapid,
   wearisome, wishy-washy

Lack-Lustre >> L Words
Lack-Lustre, definition of term: Lack-Lustre
lack-lustre_pag1.html