If you describe someone as an illustrious person, you mean that they are extremely well known because they have a high position in society or they have done something impressive.
例句
...the most illustrious scientists of the century.本世纪最杰出的科学家们...his long and illustrious career.他漫长辉煌的职业生涯
英汉词典释义
adj.
著名的, 杰出的, 卓越的
He enjoyed a long and illustrious career as a radio producer.他作为电台节目制作人的生涯漫长而辉煌。
英英词典释义
Adjective
1. widely known and esteemed;
"a famous actor""a celebrated musician""a famed scientist""an illustrious judge""a notable historian""a renowned painter"
2. having or conferring glory;
"an illustrious achievement"
3. having or worthy of pride;
"redoubtable scholar of the Renaissance""born of a redoubtable family"