This is the 12136th most frequent Swedish word.
romantiska
Romantiska: Romantic.
Here, 'romantisk' (singular form of 'romantiska') is used as an adjective describing the mood or style of the dinner, adding a sense of love or intimacy.
De hade en romantisk middag tillsammans.
They had a romantic dinner together.
In this sentence, 'romantiska' is an adjective modifying 'böcker' (books) in the plural, describing a genre that revolves around love and emotion.
Romantiska böcker är populära bland många läsare.
Romantic books are popular among many readers.
Here, 'romantisk' is used again as a descriptive adjective to qualify 'handling' (plot), emphasizing a story focused on romantic relationships.