lacking brilliance or radiance; dull

lackluster eyes.

lacking liveliness, vitality, spirit, or enthusiasm

a lackluster performance.

a lack of brilliance or vitality.

adjective

bright , enthusiastic , lively , shining , shiny , spirited

adjective

blah * , blind , boring , colorless , dark , dead , dim , drab , draggy , dry , flat * , ho-hum , laid-back * , leaden , lusterless , matte , muted , nothing * , obscure , pabulum * , prosaic , sombre , unimaginative , uninspired , vanilla * , vapid , zero * , flat , mat , arid , aseptic , earthbound , flavorless , lifeless , matter-of-fact , pedestrian , spiritless , sterile , stodgy , blah , bland , dull , humdrum