He found the target and shot the arrow.

That theory is unscientific and has no evidence at all.

He is thought to be a very unsociable person.

This design has a unique charm because it is asymmetrical.

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

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

I'm troubled by his unproductive attitude.

Syllabic characters are an important tool for expressing words.

He was a very excellent student before he turned to delinquency.

You need to use your head to solve this problem.