This is the 485th most frequent Persian word.
کافی
Enough; sufficient.
The word 'کافی' is used as an adjective meaning 'sufficient' indicating adequacy.
من برای درس خواندن به یک محیط کافی نیاز دارم.
I need a sufficient environment for studying.
Here, 'کافی' functions as an adverb to convey the sense of 'enough' in describing quantity.
آیا این غذا به اندازه کافی نمک دارد؟
Does this food have enough salt?
In this context, 'کافی' is part of the compound noun 'کافیشاپ' (coffee shop) and directly relates to the concept of coffee.