<p><strong>Adjective</strong></p><ul><li>lacking brilliance or radiance; dull: lackluster eyes.</li><li>lacking liveliness, vitality, spirit, or enthusiasm: a lackluster performance.</li><li>lacking or having lost life, sharpness, or flavor; insipid; flat: a very lackluster tea.</li></ul><p><strong>Noun</strong></p><ul><li>a lack of brilliance or vitality.</li></ul><p><strong>End of Response</strong></p>