Entry 4 senses · 2 variants Webster, 1913

Lackluster

/lăk'-lŭsˌ-tẽr/ · Lack·lus·ter · IPA /ˈlæklʌstə(ɹ)/

01 n. A lack of luster.

1.
A lack of luster.

02 a. Wanting luster or brightness.

1.
Wanting luster or brightness.
2.
Lacking spirit, liveliness, or enthusiasm; dull.
3.
Mediocre; as, a lackluster performance.