In the importance of being earnest act 2
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I have never considered Cecily silly..... she's simply a girl who acts like any other. None-the-less, her writing and avoidance of schoolbooks allow us to infer that she's far more interested in fiction and fantasy than serious thought. She is a romantic.
I think Wilde used irony to get his point across. Jack says that she is not a silly, romantic girl, but the description he provides is exactly what a silly romantic girl is.