Lacking brilliance or intelligence.
Having no shine or lustre; dull.
A faded, and an ancient dragon he was; and many a wintry storm of rain, snow, sleet, and hail, had changed his colour from a gaudy blue to a faint lack-lustre shade of gray.
Not exceptional; not worthy of special merit, attention, or interest; having no vitality.
The actor gave a lackluster performance in his latest film.
Lack of brightness or points of interest.
A person or thing of no particular brilliance or intelligence.
From lack + luster.
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Lekhori