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

• electron shell
• electron spin resonance
• electron tube
• electron volt
• electronegative
• electronegativity
• electroneutral
• electronic
• electronic balance
• electronic bulletin board
• electronic communication
• electronic computer
• electronic converter
• electronic counter-countermeasures
• electronic countermeasures
• electronic data processing
• electronic database
• electronic deception
• electronic device
• electronic dictionary
• electronic equipment
• electronic fetal monitor
• electronic foetal monitor
• electronic funds transfer
• electronic image