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lacklustre

adjective UK (US lackluster)
 
 
/ˈlækˌlʌs.tər/ US  /-tɚ/

Definition

without energy and effort: Britain's number-one tennis player gave a disappointingly lacklustre performance.Tired and making tired
(Definition of lacklustre adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
Focus on the pronunciation of lacklustre