The phrase "unsuitable for him" is grammatically correct and can be used in written English
It is used to describe something that is not appropriate or suitable for someone. Example: The job requirements were unsuitable for him as he lacked the necessary experience and skills.
While he has claimed that art school was the making of him – "it opened my mind in so many ways" – it proved unsuitable for him.
"Kanti slid down and sat on the floor," after her final meeting with the rejected doctor, who has himself returned to Katmandu from England, where he loved a woman just as unsuitable for him as Jaya is for Kanti.
Asked whether the resignation was a positive, as it would lead to a costly by-election, Mr Vaz said: "It was unsuitable for him to remain as the police and crime commissioner.
I made the decision to decline Mr. Jone's investment into a program that was complex and illiquid even though the investment itself clearly met the suitability test -- it was clear to me that it was unsuitable for him under the stricter Fiduciary standard.
One older friend said she wouldn't vote for him "because he cheats on his wife" as if this only thing that made him unsuitable for high office.
But some vendors said the corruption charges against Mr. Zardari made him unsuitable for the presidency.
Forget analysis; his lack of curiosity and empathy makes him unsuitable for it.
Ali Motahari, a conservative member of parliament, lashed out against Haddad Adel, calling him unsuitable for the position.
Mr. Berry, the incumbent, has moved from Brooklyn to Staten Island, "and this," says the World," in the face of a good record, makes him unsuitable for another term".
Mr O'Toole told Witness F of speculation "that revelations about Gareth's private life might have rendered him unsuitable for SIS work".
I feel optimistic about Gordon Brown - his natural dourness makes him unsuitable for the Little Ant and Little Dec treatment - and quite hopeful, too, about the next generation of Conservative leaders.
