brilliant

1 of 2

adjective

bril·​liant ˈbril-yənt 

1

: very bright : glittering

a brilliant light

2

a

: striking, distinctive

a brilliant example

b

: distinguished by unusual mental keenness or alertness

brilliant scientists

3

British : very good : excellent

brilliantly adverb

brilliant

2 of 2

noun

: a gem (such as a diamond) cut in a particular form with numerous facets so as to have special brightness or brilliance

Illustration of brilliant

• 1 table
• 2 bezel
• 3 girdle
• 4 pavilion
• 5 culet

Synonyms of brilliant

Adjective

• dazzling
• luminous
• shining
• glowing
• bright
• shiny
• splendid
• radiant

Noun

• gem
• jewel
• rock

Choose the Right Synonym for brilliant

bright, brilliant, radiant, luminous, lustrous mean shining or glowing with light.

bright implies emitting or reflecting a high degree of light.

brilliant implies intense often sparkling brightness.

radiant stresses the emission or seeming emission of rays of light.

luminous implies emission of steady, suffused, glowing light by reflection or in surrounding darkness.

lustrous stresses an even, rich light from a surface that reflects brightly without glittering.

Examples of brilliant in a Sentence

Adjective

a brilliant star in the sky

a store decorated in brilliant colors

He pitched a brilliant game.

She gave a brilliant performance.

She has a brilliant mind.

Noun

the diamond cutter set out an array of brilliants to show the various ways the diamond could be cut

Recent Examples on the Web

Adjective

The Shakes had an iPad commercial, a streak of brilliant late-night performances, the same nod for Album of the Year at the Grammys as Taylor Swift and Kendrick Lamar, a chart-topping album. — Craig Jenkins, Vulture, 18 Aug. 2026

Slow Horses stars Oldman as Lamb, a brilliant but cantankerous leader of dysfunctional spies who have made career-ending mistakes and end up at a dumping ground MI5 unit known as Slough House. — Jesse Whittock, Deadline, 18 Aug. 2026

But when that old lady has a team of the most brilliant attorneys in America, and when that old lady has the support of women around the world, that old lady can do the impossible. — Emma Hinchliffe, Fortune, 17 Aug. 2026

Shocking-pink bougainvillea and electric-blue morning glory twine up columns, providing a brilliant shot of color, while Javanese four-poster beds and rattan sun loungers are piled high with downy mattresses and cushions in Marni prints. — Hamish Bowles, Vogue, 16 Aug. 2026

Word History

Etymology

Adjective

French brillant, present participle of briller to shine, from Italian brillare

Noun

borrowed from French brillant, noun derivative of brillant brilliant entry 1

First Known Use

Adjective

circa 1681, in the meaning defined at sense 1

Noun

1690, in the meaning defined above

Rhymes for brilliant

• resilient

Kids Definition

brilliant

1 of 2 adjective

bril·​liant ˈbril-yənt 

1

: flashing with light : very bright

brilliant jewels

2

a

: very impressive

a brilliant career

b

: very smart or clever

a brilliant student

a brilliant idea

brilliantly adverb

brilliant

2 of 2 noun

: a gem (as a diamond) cut so as to sparkle