Definition of "lacklustre"

lacklustre

adjective
comparative more lacklustre, superlative most lacklustre
1. (Commonwealth spelling) Alternative spelling of lackluster
  Quotations
  Substitute Charlie Austin scored seven minutes into his Southampton debut as a lacklustre Manchester United were booed off at Old Trafford.
  2016 January 23, Phil Dakwes, “Man Utd 0–1 Southampton”, in (Please provide the book title or journal name)‎, BBC Sport
  With railway industry revenues continuing to sit significantly below their pre-pandemic level, and a lacklustre response by the industry to Government's calls for efficiencies and cost control, it's no surprise that the Treasury has lost faith in the railway's ability to curb its need for financial support.
  2023 March 22, Sir Michael Holden, “Comment: Slow speed ahead for High Speed”, in RAIL, number 979, page 3
noun
countable and uncountable, plural lacklustres
1. (Commonwealth spelling) Alternative spelling of lackluster
  Quotations
  Secondly, the fear of offending the military has reduced the campaigns to mere lacklustres. Promises are reeled off with so much obvious lack of passion that it is quite possible the party bosses themselves hardly believe what they say […]
  1990, The Nigerian Economist, volume 4, page lxxii