IPA: /ɪˈlʌstrɪəsli/
KK: /ɪˈlʌstrɪəsli/
In a way that is very famous and respected, often because of achievements or qualities.
She has lived an illustriously successful life, winning many awards for her contributions to science.
Illustriously → It is formed from "illustrious" (from Latin "illustrius", meaning bright or distinguished) and the suffix "-ly" (meaning in a manner of). The word "illustriously" means in a manner that is bright or distinguished, often referring to someone who is celebrated or renowned.
Think of someone who is 'bright' or 'distinguished' ('illustrious') and how they act 'in a manner' ('-ly') that reflects their fame.