lackluster

As adjectives the difference between lackluster and lusterless

is that lackluster is lacking brilliance or intelligence while lusterless is without luster, dull, not shiny, flat or matte finished.

As adjectives the difference between lackluster and lethargic

is that lackluster is lacking brilliance or intelligence while lethargic is sluggish, slow.

As adjectives the difference between lackluster and dark

is that lackluster is lacking brilliance or intelligence while dark is having an absolute or (more often) relative lack of light.

As a noun dark is

a complete or (more often) partial absence of light.

As a noun spiffy

is a spring-wire collar stay, worn by men.

As an adjective lackluster is

lacking brilliance or intelligence.

As adjectives the difference between lackluster and barbaric

is that lackluster is lacking brilliance or intelligence while barbaric is of or relating to a barbarian; uncivilised, uncultured or uncouth.

As adjectives the difference between lackluster and listless

is that lackluster is lacking brilliance or intelligence while listless is lacking energy, enthusiasm, or liveliness.

As adjectives the difference between gloomy and lackluster

is that gloomy is imperfectly illuminated; dismal through obscurity or darkness; dusky; dim; clouded while lackluster is lacking brilliance or intelligence.

As adjectives the difference between lackluster and unchallenging

is that lackluster is lacking brilliance or intelligence while unchallenging is not challenging; easy to do.

As adjectives the difference between drab and lackluster

is that drab is dull, uninteresting, particularly of colour while lackluster is lacking brilliance or intelligence.

As a noun drab

is a fabric, usually of thick wool or cotton, having a drab colour.

As a verb drab

is to consort with prostitutes.

As adjectives the difference between lackluster and prosaic

is that lackluster is lacking brilliance or intelligence while prosaic is pertaining to or having the characteristics of prose.