adjective. US (UK lacklustre) us / ˈlækˌlʌs.tɚ / uk / ˈlækˌlʌs.tə r/ Add to word list. without energy and effort: The U.S. number-one tennis player gave a disappointingly lackluster performance. SMART Vocabulary: related words and phrases. Tired and making tired. all in. anti-fatigue. at your worst idiom. be dead on your feet idiom. More @Wikipedia
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