How to Say "cryptic" in Spanish
The Spanish word for “cryptic” is “misterioso” — B2 level. This is a very common word in everyday Spanish.

Examples
El detective investiga la desaparición misteriosa del joyero.
The detective is investigating the mysterious disappearance of the jeweler.
Hay algo misterioso en el bosque que nadie se atreve a explorar.
There is something mysterious in the forest that no one dares to explore.
Su comportamiento misterioso me hace pensar que esconde algo importante.
His secretive behavior makes me think that he is hiding something important.
Agreement is Key
Since 'misterioso' is a describing word (adjective), it must change its ending to match the thing it describes in both gender and number: 'el libro misterioso' (masculine singular), 'la carta misteriosa' (feminine singular), 'los ruidos misteriosos' (masculine plural).
Forgetting the Feminine Form
Mistake: “La caja era muy misterioso.”
Correction: La caja era muy misteriosa. (Since 'caja' is feminine, the adjective must end in -a.)
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