Definition of lackluster in English:

lackluster

Syllabification: lack·lus·ter
Pronunciation: /ˈlakˌləstər
 
/
(British lacklustre)

adjective

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Word of the day astrogation
Pronunciation: ˌastrə(ʊ)ˈgeɪʃ(ə)n
noun
(in science fiction) navigation in outer space