He is a complicated man in character, sometimes easy going, sometimes unreasonable.

他是一个性格复杂的人，有时很好相处，有时不可理喻。

youdao

She knew every merit of his, but as she had been spoiled by her parents and him, she was wilful and sometimes unreasonable.

她知道他的好，但她是父母宠坏的孩子，他就像是她父母的接力棒，父母不在身边时接着宠她，所以，她撒娇，任性，有时候蛮不讲理。

youdao

Sometimes they even bear an unreasonable hatred for a child, because they believe that the child has brought the family bad luck.

有时他们甚至对孩子怀有不可理喻的仇恨，因为他们认为孩子给家庭带来了坏运气。

youdao

Sometimes this fear was unreasonable.

VOA: special.2009.11.29

And he thought the best MPs were sometimes the most unreasonable - it was their job to question things.

BBC: Obituary: Lord Weatherill