This is the 1426th most frequent Arabic word.
كافية
"كافية" means "sufficient" or "enough" in English.
Here, 'كافية' is used as an adjective to describe 'الكمية', indicating sufficiency.
الكمية هذه كافية لتحضير الحساء.
This quantity is sufficient for preparing the soup.
In this case, 'كافية' describes 'المرأة', pointing out the person's adequacy to fulfill a task.
المرأة التي تعمل في المكتبة كافية لملء الطلبات.
The woman working in the library is sufficient to fulfill the requests.
Here, 'كافياً' (masculine form of 'كافية') is used as an adjective to describe 'المطر', giving it the sense of being enough.