dim, faint, pale
The object was a dim blur in the moonlight.

blur of
a blur of fire and smoke

be all a bit of a blur, be all a blur, be just a blur
I can't remember that day very well. It's all a bit of a blur.

Blur is used with these nouns as the subject:
eye, tear, vision

Blur is used with these nouns as the object:
boundary, distinction, vision