Etymology
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lackluster (adj.)

also lack-luster, c. 1600, "dull, wanting brightness" (originally of eyes), first attested in "As You Like It," from lack (v.) + luster (n.1). Such combinations with lack- were frequent once: Shakespeare alone also has lack-love, lack-beard, lack-brain, lack-linen. Outside Shakespeare there was lackland (1590s), of a landless man; lack-Latin (1530s), of an ignorant priest; lack-learning (1590s), lack-wit (Dryden), lack-thought (1829), lack-life (1889), and the comprehensive lack-all (1850).

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Definitions of lackluster

lackluster (adj.)
lacking brilliance or vitality;
a dull lackluster life
Synonyms: lacklustre / lusterless / lustreless
lackluster (adj.)
lacking luster or shine;
staring with lackluster eyes
Synonyms: lacklustre / lusterless / lustreless
From wordnet.princeton.edu