The phrase "almost ominous" is correct and usable in written English.
It can be used to describe a situation or atmosphere that has a hint of foreboding or threat, but not strongly so.
Example: "The dark clouds gathered in the sky, creating an almost ominous feeling as we prepared for the storm."
Alternatives: "somewhat threatening" or "nearly foreboding".
You start under this great domed canopy that sits above you, almost ominous darkness, sucking you in.
That sphinx is gone, its lone, towering, almost ominous presence sacrificed to the relentless demands of mass tourism.
It looks almost mundane, hardly worthy of photographing, but there is something odd about it, almost ominous.
The weight of what goes unsaid as she and Carol talk about the towns they pass or where they might stop for breakfast builds in an almost ominous way.
She has a dark, knotty alto that conveys an almost ominous willfulness, and an astute taste in clever, offbeat songs that bring out her playful, risqué sense of humor.
For something about ominous skies and big weather and secret places almost always whispers, Big Fish.
And, almost as ominous, we see the attempts of shelf-stacker Ginger, under Jasmine's influence, to swap her car-mechanic fiance, Chilli, for a more middle-class model.
If you think back to Stephen Schwarzman's lecture, where he mentions that there's no flexibility for getting the numbers wrong, I mean certainly we feel the same way, all the analysis needs to be correct, but there's almost an ominous tone, when he says that, whereas the way that we operate is knowing that we have to move really fast in order to continue to innovate, continue to stay relevant.
Frank Kimbrough's piano flickers along the center of the album's title track, and "Nimbus" expands from an ominous, almost gypsy-like melody to a series of stormy, unfettered runs by Steve Wilson.
