How to Say "unexplained" in Spanish
The Spanish word for “unexplained” is “misteriosa” — B1 level. This is a very common word in everyday Spanish.
Examples
La mujer dejó una nota misteriosa antes de desaparecer.
The woman left a mysterious note before disappearing.
Siempre tiene una sonrisa misteriosa que no sé cómo interpretar.
She always has an enigmatic smile that I don't know how to interpret.
La causa de la falla eléctrica sigue siendo misteriosa.
The cause of the power failure remains unexplained.
Gender Agreement
Since 'misteriosa' ends in '-a', it is the feminine form. You must use it only when describing feminine words, like 'la casa' (the house) or 'la luz' (the light). For masculine words (like 'el hombre'), use 'misterioso'.
Mixing Genders
Mistake: “El carta misteriosa.”
Correction: La carta misteriosa. (Carta is feminine, even though it ends in -a.)
Related Translations
Learn Spanish with Inklingo
Interactive stories, personalized learning, and more.