他不适合我。

He won't do for me.

youdao

我断定他不适合做这项工作。

I've come to the conclusion that he's not the right person for the job.

《牛津词典》

我可能会认为他年纪太大不适合做那份工作。

I would have thought he was too old to do that job.

《柯林斯英汉双解大词典》