IPA: /ˈɪnsaɪt.fəl.i/
KK: /ˈɪnˌsaɪt͡ʃt͡fəli/
In a way that shows a deep understanding or perception of something.
She explained the complex topic insightfully, making it easier for everyone to understand.
Insightfully → It is formed from "insight" (from Old English "insihht", meaning the act of seeing within or understanding) and "-fully" (meaning in a manner full of). The word "insightfully" means in a manner that is full of understanding or perception.
Think of having a deep understanding or 'seeing within' ('insight') and doing so 'fully' — that's what it means to be insightful.