IPA: /ˈbrɪljəntli/
KK: /ˈbrɪljəntli/
In a way that shows great intelligence or skill; exceptionally well.
She solved the complex problem brilliantly during the exam.
Brilliantly → It is formed from "brilliant" (from Latin "brillare", meaning to shine) and the suffix "-ly" (meaning in a manner of). The word "brilliantly" means in a manner that shines or is exceptionally bright.
Think of something that shines brightly — 'brilliant' means to shine, and '-ly' indicates the manner. So, brilliantly means shining in a bright manner.