I am surprised at the irrationality of this system.

This system is too irrational to understand.

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.

He strongly believes in the philosophical thought, 'I think, therefore I am.'