lacklustrelack·lus·tre /ˈlækˌlʌstə-ər/ British EnglishBrE, lackluster American EnglishAmE adjectiveadjFINANCE2if a company’s or an economy’s performance is lacklustre, it is poor, with no increase in profits or with low economic growthThe economy remains lacklustre, with production and employment in the manufacturing sector either steady or declining.