This compound is an unsaturated hydrocarbon.

That information is unnecessary.

That information is completely unnecessary.

I learned how to solve inequalities in math class.

His behavior was thought to be an anomaly.

His behavior is completely abnormal.

He was punished for his disobedience to the rules.

By regularly checking the key performance indicators, you can understand the performance of the company and devise improvement measures.

He decided to start a multi-level marketing business.

He is interested in phrenology.