The phrase "a little diffuse" is correct and usable in written English.
It can be used to describe something that is spread out or not concentrated, often referring to ideas or writing that lacks clarity or focus.
Example: "The author's argument was a little diffuse, making it difficult for readers to grasp the main point."
Alternatives: "somewhat scattered" or "a bit unclear".
It was a little diffuse, musically and formally, but to his credit, Mr. Whitener managed to project a personality of his own through all the influences.
There is a little diffuse reference through devices such as musical quotation, leitmotifs, and homages.
The documentary is a little diffuse, but it's filled with memorable characters and takes a respectful look at a corner of America that other movies more often either ignore or exploit.
As a side effect of annealing, the implanted atoms usually move a little, diffusing into the surrounding material.
Page 300 was always technically the sport home page, but there was something a little too diffuse and scattered about it, where the real strength of Ceefax was its remorseless focus.
The complicated plot, divided between two love stories that turn out to have an unusual connection, threatens to get a little too diffuse and unravel like a ball of yarn rolling off a knitter's lap.
In the comparison of the algorithms for the patient population, we looked for an algorithm that would rank the population in the same order as physicians for a population likely to present with focal defects but little diffuse heterogeneity.
Tangle-predominant dementia occurring in the very old (age 80+ years) and accounting for 5 to 7% of dementia cases shows tau pathology often restricted to the limbic system, an absence of neuritic plaques, and no or very little (diffuse) amyloid deposits.
The pure nanorod arrays showed little diffuse reflectance (10% at 400 nm), and a rapid decrease in diffuse reflection capacities were observed as the visible wavelength increased from 400 to 800 nm.
In cases where two laminae possess similar topographies (for example, where both contain orderly maps for orientation) their interconnections appear precise, with little diffuse spread.
In 7-month wild-type (WT) mice, Vinculin immunoreactivity in the CA3 pyramidal neurons demonstrated punctate immunoreactivity throughout neuronal cell bodies, indicative of FCs, with little diffuse staining.
