Definitions from Wiktionary (lackluster)

▸ adjective:  Lacking brilliance or intelligence.
▸ adjective:  Having no shine or lustre; dull.
▸ adjective:  (figurative) Not exceptional; not worthy of special merit, attention, or interest; having no vitality.
▸ noun:  (uncountable) Lack of brightness or points of interest.
▸ noun:  (countable) A person or thing of no particular brilliance or intelligence.

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