From lustre + -ious, modelled after illustrious.
lustrious (comparative more lustrious, superlative most lustrious)
- (obsolete, rare) Amazing, fantastic; splendid.
1892, Walt Whitman, “Proud Music of the Storm”, in Leaves of Grass […], Philadelphia, Pa.: David McKay, publisher, […], OCLC 1514723, stanza 3, page 313:
(The teeming lady comes, / The lustrious orb, Venus contralto, the blooming mother. / Sister of loftiest gods, Alboni's self I hear.)
- (obsolete, rare) Dazzling, sparkling; beautiful.
- Synonyms: glowing, lustrous, radiant, shimmering