This is the 10945th most frequent Spanish word.
difusa
Blurry, unclear, or vague.
Here, 'difusa' is used as an adjective describing the characteristic of the light being spread out and not focused.
La luz era tan difusa que no podía leer claramente el texto.
The light was so diffused that I couldn't clearly read the text.
In this sentence, 'difusa' is used metaphorically to describe the explanation as unclear or not well-defined.
La explicación fue un poco difusa y muchos quedaron con dudas.
The explanation was a bit vague, and many were left with doubts.
Here, 'difusa' describes the concept of a memory being indistinct or not sharp in one's mind, extending its meaning to abstract contexts.