あいつは海千山千だから、取り引き相手としてはかなり手強いぞ。の英語

All those tricks he's got up his sleeve make him a formidable client.

I don't like him; he is too mercenary.

He's so strong‐willed that he'll never acquiesce.

As might be expected of someone who has gone through so many hardships [who has had such a hard life], he is a man of admirable perseverance.

Now that we've got a strong man like him at the helm, things are sure to improve.

He's a really straight-laced guy, so he doesn't like the idea of his son changing jobs.

He was so obstinate that I was forced to go to extremes―（他動詞構文にすれば）―His obstinacy forced me to go to extremes―His obstinacy drove me to extreme measures.

He was so obstinate that I was forced to go to extremes―（他動詞構文にすれば）―His obstinacy forced me to go to extremes―His obstinacy drove me to extreme measures.

He's unstoppable right now but the question is how long he can remain at the pinnacle of his career.

People are amused at his pompousness.

He is so full of conceit that everybody dislike him.

He is so full of conceit that everybody dislikes him.

He was so obstinate that I was forced to go to extremes―（他動詞構文にすれば）―His obstinacy forced me to go to extremes―drove me to extreme measures.

That man is too boastful for my liking.

That girl is so beautiful that she attracts even the most self-possessed men.

He won't be discouraged easily, as he's tough guy.

He won't be easily discouraged, because he's a tough guy.

He is a liberal, and you must not stand on ceremony with him.

Because you are an attractive man.

He is a liberal, and you must not stand on ceremony with him.

Their nimble fingers make [manual dexterity makes] the girls ideal for precision work.

You must not tell him to do a lot of things at a time. He is so forgetful.

He is so snooty I can't get along with him.

He works fast and is very articulate but his insincerity is his biggest defect.

He is good-looking, clever, and what is still better, rich.

You're really the best when, and only when, it comes to angering people.

He said that a kayak can hold its position in a rapid stream better than a raft.

He thinks himself so important that he won't vouchsafe to visit us any more.

I'm a self-supporting student so I can't have that sort of high class thing.

I'm putting myself through school, so I can't have things that are that expensive.