brilliant
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adjective
1. (of light or color) very bright and radiant.
〖通例名詞の前で〗光り輝く, きらきら光る〈日光など〉; 鮮やかな〈色など〉 (!brightより強い輝き)
2. exceptionally clever or talented:
〈人･考え･演技などが〉すばらしい, 見事な; 才能あふれる, 優秀な
e.g. a brilliant young mathematician
e.g. a brilliant idea.
outstanding; impressive:
〈業績･成功などが〉輝かしい, 立派な
e.g. his brilliant career at Harvard.
3. British informal very good, excellent, or marvelous:
｟英話｠ すてきな, 楽しい; 〈人が〉 【人に対して】とても親切な «with»
e.g. we had a brilliant time
e.g. as exclamation : “Brilliant!” he declared excitedly as she finished telling him what had happened.
noun
a diamond of brilliant cut.
ブリリアントカットの宝石, ダイヤモンド
ORIGIN
late 17th century: from French brillant ‘shining’, present participle of briller, from Italian brillare, probably from Latin beryllus (see beryl).