unˈlustrous,a. (un-1 7.) 1709Rowe Shakspere's Cymb. i. vii. 127 An Eye, Base and unlustrious [sic; 1623 illustrious] as the smoaky Light That's fed with stinking Tallow.1790A. Seward Lett. (1811) II. 378 How dim and unlustrous is Mr. Merry's muse!1863W. Lancaster Praeterita 70 Sweet unlustrous eyes.