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lacklustre (adj.)

also lack-lustre, chiefly British English spelling of lackluster (q.v.); for spelling, see -re.

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Definitions of lacklustre from WordNet

lacklustre (adj.)
lacking brilliance or vitality;
Synonyms: lackluster / lusterless / lustreless
lacklustre (adj.)
lacking luster or shine;
Synonyms: lackluster / lusterless / lustreless
From wordnet.princeton.edu