This is the 780th most frequent Persian word.
روانی
"روانی" means "mental," "psychological," or "insane," depending on context.
Here, 'روانی' refers to 'mental', describing 'illness' as 'mental illness'.
او به دلیل بیماری روانی نیاز به درمان دارد.
He needs treatment because of his mental illness.
In this context, 'روانی' refers to a book that is 'smooth' or 'flowing,' meaning it is easy and pleasant to read.
کتاب روانی برای مطالعه انتخاب کردم.
I chose an easy-flowing book to read.
Here, 'روانی' describes 'movement' as 'smooth,' indicating an effortless and effective action.