The phrase "a thorough man" is correct and usable in written English.
It can be used to describe someone who is meticulous, detailed, and diligent in their work or approach to tasks.
Example: "As a thorough man, he always double-checks his work to ensure accuracy and completeness."
Alternatives: "a meticulous person" or "a detail-oriented individual."
He was an unusually thorough man, at times too thorough for our liking.
"He totally went against all the stereotypes of homeless folks," said Jon Bunge, a caseworker with Project Hope, another of the social service agencies that found work for the "soft-spoken, incredibly thorough" man who listed his best quality as his love of learning.
The thorough man of business knows that only by years of patient, unremitting attention to affairs can he earn his reward, which is the result, not of chance, but of well-devised means for the attainment to ends.
Following a thorough investigation the man was released with no further action to be taken against him," the police said.
I do believe that this film is his masterpiece: it's so rich in terms of ideas, feelings, sensations, and he has such a thorough understanding of men, women, the different stages of life and aspects of our contemporary society.
I found him to be a hardworking, thorough, decent man.
The two sides met at Redwood Ferry, where the Indians gave the soldiers a thorough drubbing, killing 24 men.
Or it could be understood extravagantly as a thorough grasp of reality and man's place therein.
Because of Trump's maneuver and Whitaker's "acting" status — which could allow him to serve more than 200 days — we'll never get a thorough public vetting of the man leading the Justice Department.
In his book about the United States' qualification for the World Cup, "Chasing the Game," Filip Bondy, a columnist with The Daily News, described Bradley as "wholly analytical, glum, flirting with dour," but also a dedicated family man and a "thorough professional" with whom others enjoyed working.
