The phrase "a pitiless eye" is correct and usable in written English.
It can be used to describe a gaze or perspective that is unforgiving or lacking compassion, often in a literary or metaphorical context.
Example: "The critic's review was harsh, reflecting a pitiless eye that scrutinized every flaw in the performance."
Alternatives: "an unyielding gaze" or "a merciless stare."
But he also has a pitiless eye.
He's difficult not only because he is disabled -- Mr. Amelio addresses his difficulties with a pitiless eye -- but also because he is a teenager.
Their spawn are pawns, and Tolkin casts a pitiless eye on them: "No matter how much they tried, the children were awful, even the sweetest".
Jordan Glass, a photojournalist with "a pitiless eye" for pain and suffering, stumbles onto this vile cottage industry when she visits a Hong Kong museum and recognizes one of the comatose models in a series of nude studies as her twin sister, who has been missing for over a year from her New Orleans home.
Jose Mourinho, the Porto coach who is his expected successor, will have cast a more pitiless eye over the team he is to inherit.
Chekhov was a doctor and by the time he wrote the play he knew he was dying: it is, therefore, with a forensic and pitiless eye that he shows how people behave.
It's had readers and critics sobbing over its heightened portrayal of good and evil, selfless love and twisted perversion, and combines a pitiless scientific eye for what flesh can be subjected to with an ethereal sense of how art can make the spirit soar.
The New York University communication scholar Siva Vaidhyanathan has even proclaimed "the collapse of inconvenience" to a Boston Globe writer, referring to the millions of Web users who employ the pitiless eye of search engines to hunt for awkward personal data, from youthful indiscretions to middle-aged eccentricities and worse.
With transfats gone and sugar under attack, salt may be the next ingredient to come under the pitiless eye of the law.
The people in Gaitskill's stories often behave unconventionally and impulsively; they may seem to have an agency outside their author's control, doing what not even she could expect, but they never escape her pitiless eye and meticulous hand.
Victorian England was shocked by the brutality of the massive police operation conducted under the pitiless eyes of a jeering crowd as a snow storm raged: out into the night they came to face the elements, emaciated, bright-eyed, singing, the remaining 20 men, 50 women, and 66 infants who now constituted the Children of God.
