IPA: /ˈliːfiəst/
KK: /ˈliːfɪəst/
Having the most leaves or being the most covered with leaves.
The leafiest tree in the park provides the best shade on hot days.
Comparative: leafier
Superlative: leafiest
Leafiest → It is formed from "leaf" (from Old English "leāf", meaning the foliage of a plant) and "-iest" (a superlative suffix indicating the most). The word "leafiest" means having the most leaves or being the most full of foliage.
Think of 'leaf' as the part of a plant that is full of greenery, and '-iest' means the most. So, when you hear 'leafiest', imagine a plant that is the most full of leaves.