The phrase "a sinister blue" is correct and usable in written English.
It can be used to describe a shade of blue that evokes feelings of unease or foreboding, often in a literary or artistic context.
Example: "The room was painted in a sinister blue, casting eerie shadows that made everyone feel uncomfortable."
Alternatives: "an ominous blue" or "a menacing blue".
They held an outreach day to lawmakers in early December and have for months been circulating a comic depicting the industry as a sinister blue dog with blazing red eyes, sharp teeth and collar labeled "PBM". "They're right here in the middle, and everyone is kind of dropping a coin in their bucket.
On the run from "bad men," headed by a stone-faced Matthew Modine in a sinister blue suit and ignorant of basic human relationships, El (as the boys call her) is more alien than "E.T".
Major "Joe" Bagstock, one of those who predates on the loftily oblivious Mr Dombey, is a sinister, blue-faced old soldier with the disconcerting habit of talking of himself in the third person to an invisible confidante.
We never had any shop-bought shampoos or deodorants – we just had a series of slightly sinister blue and white canisters marked Project 54 or Sample 8, although some of the deodorants would also have on them a, by my 13-year-old standards, quite erotic line drawing of a flowing-haired woman administering the spray under her arms.
His rearrangement of "Born in the U.S.A". from a rousing, bombastic anthem that could easily be misconstrued as celebratory into a sparse and sinister blues, performed on a twelve-string acoustic guitar, with a slide felt deliberate (he sang the first verse unamplified and unaccompanied).
— from a rousing, bombastic anthem that could easily be misconstrued as celebratory into a sparse and sinister blues, performed on a twelve-string acoustic guitar, with a slide — felt deliberate (he sang the first verse unamplified and unaccompanied).
The resulting images are beautiful, suffused with a sinister deep-blue inkiness, each with an unnaturally straight black line running over the sand and detritus on the seafloor — the cable itself, just sitting there.
With a dark blue background, Allawi's posters are a bit sinister.
Among a long list of highlights are the spacey, sinister blues of Nothing as it Seems, the rustic waltz of Elderly Woman Behind the Counter, the droning quasi-raga Who are You and the uncoiling blast of Given to Fly.
I thought of the sinister blue-eyed, black-coated boy crouched in the fetid doorway across from the French Market with his new little dog and his three acolytes.
Invader rifled through a stack of finished works and selected a postersize board, peeling back an adhesive coating to reveal an instantly recognizable pixel portrait in baby blue, black and white, with sinister dark blue Invader figures descending in the background.
