His plan was so unrealistic that no one could believe it.

He is conducting research on historical kana usage.

He often thinks about problems from a humanitarian perspective.

His company is facing the risk of a hostile takeover.

He is spending a lot of time on experimental research.

That plan is too impractical, it's difficult to implement.

I'm troubled by his unproductive attitude.

He was affected by secondary effects.

In behavioral sciences, the use of metatools plays a crucial role.

He is writing a thesis on dialectical materialism.