lackluster (adj.)

• achromatic
• achromic
• anemic
• ashen
• ashy
• blind
• bloodless
• cadaverous
• colorless
• dead
• deadened
• dim
• dimmed
• dingy
• drab
• dull
• etiolated
• exsanguine
• faded
• faint
• fair
• fairish
• fallow
• flat
• ghastly
• gray
• haggard
• hueless
• indifferent
• insipid
• leaden
• lifeless
• livid
• lurid
• lusterless
• mat
• mealy
• mediocre
• medium
• middling
• moderate
• modest
• muddy
• muted
• namby-pamby
• neutral
• pale
• pale-faced
• pallid
• passable
• pasty
• prosaic
• prosy
• respectable
• rusty
• sallow
• sickly
• so-so
• somber
• tarnished
• tedious
• tolerable
• toneless
• uncolored
• vapid
• wan
• washed-out
• waxen
• weak
• white
• wishy-washy