@timross Exactly. However, if you're referring to a female person's personality, it's better to use "Αυτή είναι ενδιαφέρων χαρακτήρας". You could use your original phrase, but there has to be some context mentioned previously. Or else there might be a follow up question. "Τι/Ποια είναι ενδιαφέρουσα;" A woman, the plot of a book, a situation? (All these are feminine genus).
Fun fact: If you use the expression "Αυτή είναι σε ενδιαφέρουσα" it means "She is pregnant".
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