1. Lacking brilliance or vitality
   "a dull lacklustre life"
   - lackluster [US], lusterless [N. Amer], lustreless [Brit, Cdn] 
2. Lacking lustre or shine
   "staring with lacklustre eyes"
   - lackluster [US], lusterless [N. Amer], lustreless [Brit, Cdn]

See also: dull, hebetudinous

• Lupinus texensis
• lupus
• lupus erythematosus
• lupus vulgaris
• lurch
• lurcher
• lure
• lurgy
• lurid
• luridly
• luridness
• lurk
• lurker
• lurking place
• Lusaka
• Lusatian
• Luschka's tonsil
• Luscinia
• Luscinia luscinia
• Luscinia megarhynchos
• luscious
• lusciously
• lusciousness
• lush
• lushly