Adjective:
misteriotsua, mistikoan, bitxi, mistiko, sekretua, sotila, ezkutaturik, ezkutuko, sakramentu, Ocultista, esoterikoak, konfidentzialak, pribatua, ezezaguna, ilun, argitaragabeak, ezkutuak, klandestinoa, iluntzeko, sakona, eskuraezinak, ulertezina, hutsala, igartezin, ulertezinak.
So, while I'm waiting for this MYSTERIOUS perfect match
Your turn, my MYSTERIOUS foreign beauty.
The mind's a MYSTERIOUS thing, Leonard.
The MYSTERIOUS foreign beauty. You'll have suitors lining up.
You're a suspect in the MYSTERIOUS murder