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“brilliant” in Latin

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

brilliant
splendidus (PROP. and IMPROP.): splendens: fulgens: nitens: nitidus [SYN. in BRIGHT]: micans (glitteringly bright): illustris: magnificus (IMPROP., the latter referring more to the real nature of the thing). The brilliant passages in a poem, eminentia ium (Quint.): brilliant achiavements, magnificae res gestae: facta splendida. To gain a brilliant victory, magnifice vincere. A brilliant reputation, nomen illustre.
brilliant s.
*adamas quadratis areolis.

Quick answer

What is the Latin word for brilliant?
The usual Latin words for “brilliant” are splendidus, splendeō, fulgeō; also niteō, nitidus, micō. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.