Lacklustre means dull, and lacking any spark. A lacklustre performance.
It is a reviewer's word and describes something competent and lifeless. Americans spell it lackluster, and the lustre in it is literal shine.
1adjectivelacklustreDull, and lacking any spark.
“The whole second half was lacklustre and the crowd said so.”
lacklustre is a quality.
Also accepted in games: lackluster
From lack + lustre.
Etymology from Wiktionary, CC BY-SA