Based on its context in the paragraph above, what is the meaning of cryptic?

    Arianna's behavior was cryptic to say the least. The momentary bursts of laughter between her tears completely baffled us. Arianna, the peer advocate, had never been so out of touch with herself. As her best friend, I tried hard to lift her spirit. However, the grimace in her face at my every attempt to do so discouraged me. Arianna did not want to watch a movie, enjoy ice cream, or go for a walk. I could not watch Arianna sit frozen on her couch anymore, and I needed help rolling her out from the inertia. So I convinced the school counselor to pay Arianna a visit

this is probably the paragraph you are talking about :) so your answer would be puzzling

the words "strangest" and "unusual" suggest (: