- lacking brilliance or radiance; dull: lackluster eyes.
- lacking liveliness, vitality, spirit, or enthusiasm: a lackluster performance.
- a lack of brilliance or vitality.
adj.also lack-luster, c.1600, first attested in “As You Like It,” from lack + luster. Combinations with lack- were frequent in 16c., e.g. lackland (1590s), of a landless man; lack-Latin (1530s), of an ignorant priest.