"Luster" means "shine"; something which lacks it isn't shiny. And that's what lackluster means: dull and insipid.
The word lackluster is an adjective, a word that describes a noun. Adjectives do not have singular and plural forms, they have comparative forms, which are lackluster, more lackluster, most lackluster.
my brother is a very lackluster person
Lackluster was born on 1978-10-26.
Lackluster Me was created on 1997-10-06.
Johnny had a lackluster performance in his last game.
The lackluster shine was created by using a flat finish.
lackluster means lacking brillance, dull (The actor gave a lackluster performance in his latest film.) Google the word to get more info.
Unenthusiastic means not showing any enthusiasm - indifferent, apathetic, half-hearted, lukewarm, tepid, casual, cool, lackluster, subdued, or unmoved.
Lackluster means lacking radiance, dull. Cindy's lackluster complexion made her strange and unattractive to many men because she was in Florida. She was not beautifully bronze or even red like most women.
"Darin Geltzer, and his band, Matching Bandages, have never given a lackluster performance!" (Lackluster means not having any vitality or just simply uninspired! )
The root word of "lackluster" is "lack," which means to be without something that is needed or wanted.
"Briliant", "Superb".