"just discernible" is a grammatically correct phrase that is commonly used in written English.
It is most often used to describe something that is barely visible, audible, or perceptible. For example, "The quiet sound of the rain was just discernible in the otherwise still night."
Kelly wears a soft sweater and, beneath it, a white blouse, whose demure collar is just discernible.
True, an improvement of 0.3% is only just discernible but it has happened in the face of strong deflationary winds.
Was there, after all these years, a just discernible note of exasperation, a regretful sense that her children's appetites were not equal to their bafflement at her avidity?
The incident produced a certain panicky, just discernible exchange of meaningful glances for the rest of the week between the tourists and the touristed.
Anyway, he got through it, and sat clutching his arm and making small talk with Angela Eagle for the rest of the session, a thin smile of relief just discernible under the moustache.
Tucked in to the right of him a sober portrait of an elderly lady by Rembrandt, gnarled hands crossed piously one upon another, is just discernible through the reflective sheen of the varnish.
Stand in its midst on an ink-blue summer night and you could witness twinkling meteor showers, the aurora borealis, or the just-discernible thumbprint of the Andromeda galaxy.
Even when everything's getting crazy in episode five, there's still time to pause, to let what's happening around Max fade into a just-discernible blur, there's clearly enough but not so much that it's making every sweat gland work overtime.
Through the window behind him, Victorian rooftops are just barely discernible in the late-afternoon fog.
The cheating is curiously just as discernible up in the gods as watching on television or at least so we convince ourselves.
A microscopic image of the physical mark stored in the phase-change sample as a result of this addition is shown in Figure 3 and is just about discernible to the eye.
