This is the 11223rd most frequent Spanish word.
enigmática
Mysterious or puzzling.
Here, 'enigmática' is used as an adjective describing the woman, implying she has a mysterious or puzzling nature.
La mujer enigmática entró en la habitación, y todos se preguntaron quién era.
The enigmatic woman entered the room, and everyone wondered who she was.
In this case, 'enigmática' qualifies 'sonrisa', referring to the intriguing and ambiguous characteristic of the smile.
Su sonrisa enigmática dejó a todos intrigados.
Her enigmatic smile left everyone intrigued.
Here, 'enigmática' describes the 'situación', indicating its complexity and mysteriousness.