lacking in sheen, brilliance, or vitality: dull, mediocre.lack/lusterTumblr (3.0; @lackluster)http://lackluster.tumblr.com/we are ugly, but we have the music.http://lackluster.tumblr.com/post/254914956http://lackluster.tumblr.com/post/254914956Mon, 23 Nov 2009 19:25:20 -0500