IPA: /ˈplɛntɪfəli/
KK: /ˈplɛntɪfəli/
In a way that is abundant or in large quantities.
The garden produced vegetables plentifully this year.
Plentifully → It is formed from "plentiful" (from Middle English *plentif*, meaning abundant) and the suffix "-ly" (meaning in a manner of). The word "plentifully" means in an abundant manner or to a great extent.
Think of 'plentiful' meaning abundant, and remember that 'plentifully' describes doing something in an abundant way.