IPA: /ˈdɪlɪdʒəntli/
KK: /ˈdɪlɪdʒəntli/
In a way that shows careful and persistent effort or hard work.
She worked diligently on her project to ensure it was perfect.
Diligently → It is formed from "diligent" (from Latin "diligentem", meaning careful or attentive) and the suffix "-ly" (meaning in a manner of). The word "diligently" means in a careful or attentive manner.
Think of being "careful" and "attentive" when you do something — that's what it means to do it diligently.